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Dr.T.V.Rao MD   1
Fleming and Penicillin




         Dr.T.V.Rao MD   2
Self Medication
• The greatest possibility of evil in self-
  medication is the use of too small doses so
  that instead of clearing up infection, the
  microbes are educated to resist penicillin and
  a host of penicillin-fast organisms is bread
  out which can be passed to other individuals
  and from them to other until they reach
  someone who gets a septicemia or a
  pneumonia which penicillin cannot save.
            Sir AlexanderFlemming
                     Dr.T.V.Rao MD             3
Antibiotic brands
•   50 penicillin's          • 9 macrolides
•   71 cephalosporins        • 2 streptogramins
•   12 tetracycline's        • 3 dihydrofolate
•   8 aminoglycosides          reductase
•   1 monobactam               inhibitors
•   5 Carbapenems            • 1 oxazolidinone
                             • 5.5 quinolones

                    Dr.T.V.Rao MD                 4
Evolution of Enzymes
         Plasmid-Mediated TEM and SHV
                                      b-Lactamase
                                   Third-Generation
Ampicillin                         Cephalosporins


              1965         1970s       1980s                1987       2000
                                                 1983



  1963
                           TEM-1
             TEM-1                                          ESBL   >120 ESBLs
                           Reported in            ESBL in
             E coli                                         in     Worldwide
                           28 Gram-               Europe
             S paratyphi                                    United
                           Negative
                                                            States
                           Species

                                Dr.T.V.Rao MD                             5
Development of anti-microbials
                                                                                             ertapenem
                                                                                              tigecyclin
The development                                                                          daptomicin
                                                                                           linezolid
                         of anti-infectives …                                        telithromicin
                                                                                 quinup./dalfop.
                                                                                cefepime
                                                                            ciprofloxacin
                                                                          aztreonam
                                                                        norfloxacin
                                                                      imipenem
                                                                    cefotaxime
                                                                 clavulanic ac.
                                                             cefuroxime
                                                       gentamicin
                                                      cefalotina
                                                 nalidíxico ac.
                                                ampicillin
                                           methicilin
                                      vancomicin
                                    rifampin
                           chlortetracyclin
                         streptomycin
              pencillin G
  prontosil
          1920         1930      1940      1950 1960
                                             Dr.T.V.Rao MD      1970      1980      1990      2000    6
1962 and 2000, no major classes of
  antibiotics were introduced




                     Fischbach MA and Walsh CT Science 2009
              Dr.T.V.Rao MD                               7
A Changing Landscape for
             Numbers of Approved Antibacterial Agents
                                        18

                                        16
            Number of agents approved




                                        14

                                        12




                                                                                                                                       Resistance
                                        10

                                         8

                                         6

                                         4

                                         2
                                                                                                                                 0
                                         0
                                             1983-87   1988-92         1993-97              1998-02             2003-05         2008
 Bars represent number of new antimicrobial agents approved by the FDA during the period listed.

Infectious Diseases Society of America. Bad Bugs, No Drugs. July 2004; Spellberg B et al. Clin Infect Dis. 2004;38:1279-1286;
New antimicrobial agents. Antimicrob Agents Chemother. 2006;50:1912
Dr.T.V.Rao MD   9
Antibiotics
• Biology and Society
  About 50% of the antibiotics produced
   today are used in the livestock industry.
     What impact does this have on the
       treatment of human diseases?




                        Dr.T.V.Rao MD          10
ANTIMICROBIAL RESISTANCE:
    The role of animal feed antibiotic additives


• 48% of all antibiotics by weight is added to
  animal feeds to promote growth. Results
  in low, sub therapeutic levels which are
  thought to promote resistance.
• Farm families who own chickens feed
  tetracycline have an increased incidence of
  tetracycline resistant fecal flora


                      Dr.T.V.Rao MD                11
Prescribing an antibiotic
 Is an antibiotic necessary ?
 What is the most appropriate
  antibiotic ?
 What dose, frequency, route and
  duration ?
 Is the treatment effective ?
               Dr.T.V.Rao MD     12
How are antibiotics overused or
           Misused?
• Seven out of ten Americans receive
  antibiotics when they seek
  treatment for a common cold!
  Only one-third of patients use
  antibiotics the way doctors tell them.
• This allows bacteria to become
  resistant by not killing them
  completely.     Dr.T.V.Rao MD        13
Antibiotic Prescribing
           Children are real Concern
• Antibiotics were
  prescribed in 68% of
  acute respiratory tract
  visits – and of those,
  80% were unnecessary
  according to CDC
  guidelines
• Children are of
  particular concern
  because they have the
  highest rates of
                          Dr.T.V.Rao MD   14
  antibiotic use.
We too Contribute for Creating
      Drug Resistance
                      • Every time a person
                        takes antibiotics,
                        sensitive bacteria are
                        killed, but resistant
                        microbes may be left to
                        grow and multiply.
                        Repeated and improper
                        uses of antibiotics are
                        primary causes of the
                        increase in drug-
                        resistant bacteria.
             Dr.T.V.Rao MD                    15
The consequences of antibiotic
               resistance
     • Increased morbidity & mortality
       – “best-guess” therapy may fail with the patient’s
         condition deteriorating before susceptibility results
         are available
       – no antibiotics left to treat certain infections
     • Greater health care costs
       – more investigations
       – more expensive, toxic antimicrobials required
       – expensive barrier nursing, isolation, procedures, etc.
     • Therapy priced out of the reach of some
       third-world countries
16                             Dr.T.V.Rao MD
Costs Associated with
         Increased Bacterial
             Resistance
• ↑Treatment failures
• ↑Morbidity and mortality
• ↑Risk of hospitalization
• ↑Length of hospital stays
• ↑Need for expensive and broad
  spectrum antibiotics
                Dr.T.V.Rao MD     17
Social factors fuelling resistance

     • Poverty encourages the development of
       resistance through under use of drugs
       – Patients unable to afford the full course of
         the medicines
       – Sub-standard & counterfeit drugs lack
         potency
     • Globalization, increased travel and
       trade ensure that resistant strains
       quickly travel elsewhere. So does excessive
18
       promotion.         Dr.T.V.Rao MD
Developed countries Overuse
• In wealthy countries, resistance is emerging
  for the opposite reason – the overuse of
  drugs.
• Unnecessary demands for drugs by patients
  are often eagerly met by health services and
  stimulated by pharmaceutical promotion
• Overuse of antimicrobials in food production
  is also contributing to increased drug
  resistance.

                     Dr.T.V.Rao MD               19
Classification of Pencillins
• Natural
   Benzyl penicillin
   Phenoxymethyl penicillin Penicillin v
 Semi synthetic and pencillase resistant
 1 Methicillin
 2 Nafcillin
 3 Cloxacillin
 4 Oxacillin
 5 Floxacillin


      Dr.T.V.Rao MD                        20
Macrolides,Azalides,Ketolides
• Contain macro cyclic
  lactone ring
  Erythromycin. Is
  popularly used drug
• Other drugs
  Roxithromycin,Azithromy
  cin
• Inhibits the protein
  synthesis.
• Used as alternative to
  pencillin allergy patients.

       Dr.T.V.Rao MD                  21
Dr.T.V.Rao MD   22
Cephalosporins
• Like penicillin acts
  similar
• Products of the molds
  of genus
  Cephalosporium
  except cefoxilin
• Divided into 4
  generation of
  Cephalosporins
  depending on the
  spectrum of activity.
      Dr.T.V.Rao MD       23
Major generations of
               Cephalosporins
• Cephalosporins are divided into 3 generations:
• 1st generation: Cephalexin, cefadroxil,
  cephradine
• 2nd generation: Cefuroxime, cofactor
• 3rd generation: cefotaxime, Ceftazidime,
  cefepime - these give the best CNS penetration
• 4th generation Cephalosporins are already
  available

                      Dr.T.V.Rao MD                24
Different Generations of
           Cephalosporins
• Cephalosporins are
  grouped into
  "generations" based on
  their spectrum of
  antimicrobial activity. The
  first Cephalosporins were
  designated first
  generation while later,
  more extended spectrum
  Cephalosporins were
  classified as second
  generation
  Cephalosporins.
       Dr.T.V.Rao MD             25
5th Generation Cephalosporins
• Ceftaroline is a new intravenous (IV)
  cephalosporin that was FDA-approved
  October 2010. It is labelled for the
  treatment of adults with infections
  caused by susceptible bacteria,
  specifically skin and skin structure
  infections (SSSIs) caused by methicillin-
  sensitive
                    Dr.T.V.Rao MD             26
5th Generation Cephalosporins
• Staphylococcus aureus (MSSA), methicillin-
  resistant S aureus (MRSA), Streptococcus
  pyogenes, Streptococcus agalactiae,
  Escherichia coli, Klebsiella pneumoniae, or
  Klebsiella oxytoca; and community acquired
  pneumonia (CAP) caused by Streptococcus
  pneumoniae (with or without concurrent
  bacteraemia), MSSA, E coli, Haemophilus
  influenza, K.pneumoniae, or K oxytoca
                     Dr.T.V.Rao MD              27
Ceftaroline is effective …
• Ceftaroline is a fifth generation
  cephalosporin with excellent
  activity against GPCs including
  MRSA & DRSP Affinity for all PBPs
  including PBP 2’ and PBP 2X Not
  ESBL stable, Not active against
  Non fermenters
               Dr.T.V.Rao MD      28
Irrational Use of Third Generation
          Cephalosporins
• Several studies have
  demonstrated that patterns
  of antibiotic usage greatly
  affect the number of
  resistant organisms which
  develop. Overuse of broad-
  spectrum antibiotics, such
  as second- and third-
  generation Cephalosporins,
  generate resistant strains.



                           Dr.T.V.Rao MD   29
Advantages with Newer generations

• Each newer generation of cephalosporins
  has significantly greater gram-negative
  antimicrobial properties than the
  preceding generation, in most cases with
  decreased activity against gram-positive
  organisms. Fourth generation
  cephalosporins, however, have true
  broad spectrum activity
                  Dr.T.V.Rao MD          30
Other Beta-lactams include
• Other beta-lactams include:
• Aztreonam: a monocytic beta-
  lactam, with an antibacterial
  spectrum which is active only against
  Gram negative aerobes, including
  Pseudomonas aeruginosa, Neisseria
  meningitides and N. gonorrhoea.
                 Dr.T.V.Rao MD        31
How are Carbapenems Used?
Uses by Clinical Syndrome        Use by Clinical Isolate
• Bacterial meningitis             Acinetobacter spp.
                                   Pseudomonas aeruginosa
• Hospital-associated
                                   Alcaligenes spp.
  sinusitis
                                   Enterobacteriaceae
• Sepsis of unknown origin              Mogenella spp.
• Hospital-associated                   Serratia spp.
  pneumonia
                                        Enterobacter spp.
                                        Citrobacter spp.
                                        ESBL or AmpC + E. coli
                                         and Klebsiella spp.


 Reference: Sanford Guide MD
                        Dr.T.V.Rao                           32
Spectrum of Activity
            Strep spp. &     Entero-        Non-
Drug                                                  Anaerobes
               MSSA        bacteriaeae   fermentors


Imipenem         +             +             +           +


Meropenem        +             +             +           +

                                          Limited
Ertapenem        +             +          activity
                                                         +


Doripenem        +             +             +           +
Emerging Carbapenem Resistance in
        Gram-Negative Bacilli

• Significantly limits treatment options for
  life-threatening infections
• No new drugs for gram-negative bacilli
• Emerging resistance mechanisms,
  carbapenemases are mobile,
• Detection of carbapenemases and
  implementation of infection control practices
  are necessary to limit spread
                     Dr.T.V.Rao MD             34
Daptomycin           (Cubicin®)

• New drug class (lipopeptide)
• Rapidly bactericidal
• New mechanism of action: acts by
  binding to cell membrane and disrupting
  the cell membrane potential
• No cross resistance
• Dose: 4-6 mg/kg once daily
Other drugs
• Imipenem: a
  carbapenem with a
  broader spectrum of
  activity against Gram
  positive and negative
  aerobes and
  anaerobes. Needs to
  be given with
  cilastatin to prevent
  inactivation by the
  kidney.
      Dr.T.V.Rao MD                 36
Quinolones
• Quinolones are the first
  wholly synthetic
  antimicrobials. The
  commonly used
  Quinolones.
• Act on the DNA gyrase
  which prevents DNA
  polymerase from
  proceeding at the
  replication fork and
  consequently stopping
  synthesis.
       Dr.T.V.Rao MD                37
Aminoglycosides
• Aminoglycosides are group of
  antibiotics in which amino
  sugars liked by glycoside bonds
• Eg Streptomycin,
• Act at the level of Ribosome's
  and inhibits protein synthesis
• Other Aminoglycosides –
 Gentamycin,
   neomycins,paromomycins,tobr
   amycins Kanamycins and
   spectinomycins


        Dr.T.V.Rao MD               38
Dr.T.V.Rao MD   39
Tetracycline's
• Broad spectrum antibiotic
  produced by Streptomyces
  species
• 1. Oxytetracycle,
  chlortetracycle and
  tetracycline
• Tetracyclnes are bacteriostatic
  drugs inhibits rapidly
  multiplying organisms
• Resistance develops slowly
  and attributed to alterations
  in cell membrane permeability
  to enzymatic inactivation of
  the drug

        Dr.T.V.Rao MD                40
Other Antimicrobial agents
• Lincomycins
    Clindamycin
   resembles Macrolides
   in biting site and
   antimicrobial activity.
 Streptogramins
    Quinpristin /
   dalfopristin
     useful in gram
   positive bacteria
      Dr.T.V.Rao MD               41
Antibiotics in Anaerobes
• Major anaerobes –
  Anaerobic cocci,
  clostridia and
  Bactericides are
  susceptible to Benzyl
  pencillin
• Bact.fragilis as well as
  many other anaerobes
  are treatable with
  Erythromycin,Lincomycin,
  tetracycline and
  Chloramphenicol
• Clindamycin is effective
  against many strains of
  Bacteroides
       Dr.T.V.Rao MD              42
Metronidazole in Anaerobic
               Infections
• Since the discovery of
  Metronidazole in 1973
  since then it was
  identified as leading
  agent anaerobes.
• But also useful in treating
  parasitic infections
     Trichomonas,
  Amoebiasis and other
  protozoan infections.


       Dr.T.V.Rao MD                43
Treatment of N. gonorrhoea
• Only current CDC-recommended options for treating
  N. gonorrhoea infections are from a single class of
  antibiotics, the cephalosporins.
   – Ceftriaxone, available only as an injection, is the
     recommended treatment for all types of gonorrhea
     infections (i.e., urogenital, rectal, and pharyngeal).
   – Cefixime is the only oral agent recommended for
     treatment of uncomplicated urogenital or rectal gonorrhea

    Reduced susceptibility to cefixime being described in
    Japan and other countries
Drug Resistance
• In spite discovery of several
  antibiotics several
  microorganisms attained
  resistance.
• The major factor contributing
  to persistence of infectious
  disease has been the
  tremendous capacity of
  microorganisms for
  circumventing the action of
  inhibitory drugs.
• The drug resistance continues
  to be a threat for usefulness of
  the chemotherapeutic agents.

         Dr.T.V.Rao MD                     45
Inappropriate Antibiotic Use

   Use of antibiotics
    with no clinical
    indication (eg, for
    viral infections)

   Use of broad
    spectrum antibiotics
    when not indicated
   Inappropriate choice
    of empiric antibiotics



    Dr.T.V.Rao MD                  46
Multi Drug resistant pathogens
• If a bacterium carries
  several resistance
  genes, it is called
  multiresistant or,
  informally, a
  superbug. The term
  antimicrobial
  resistance is
  sometimes use to
  explicitly encompass
  organisms other than
  bacteria MD
       Dr.T.V.Rao                 47
Extended-Spectrum β-Lactamases
• β-lactamases capable of conferring bacterial resistance to

    – the penicillins
    – first-, second-, and third-generation
      cephalosporins
    – aztreonam
    – (but not the cephamycins or carbapenems)
• These enzymes are derived from group 2b β-lactamases (TEM-1, TEM-2,
  and SHV-1)

    – differ from their progenitors by as few as
      one AA                          Dr.T.V.Rao MD                     48
Antibiotic Resistance
       Threat to Humans and Animals
• Antibiotic resistance has
  become a serious
  problem in both
  developed and
  underdeveloped nations.
  By 1984 half of those
  with active tuberculosis
  in the United States had a
  strain that resisted at
  least one antibiotic. In
  certain settings, such as
  hospitals and some
  childcare location
       Dr.T.V.Rao MD                  49
Carbapenemases
• Ability to hydrolyze penicillins, cephalosporins,
  monobactams, and carbapenems
• Resilient against inhibition by all commercially viable ß-
  lactamase inhibitors
   – Subgroup 2df: OXA (23 and 48) carbapenemases
   – Subgroup 2f : serine carbapenemases from molecular class
     A: GES and KPC
   – Subgroup 3b contains a smaller group of MBLs that
     preferentially hydrolyze carbapenems
       • IMP and VIM enzymes that have appeared globally, most
         frequently in non-fermentative bacteria but also in
         Enterobacteriaceae

                                   Dr.T.V.Rao MD                 50
K. pneumonia carbapenemases)
• KPCs are the most
  prevalent of this
  group of enzymes,
  found mostly on
  transferable plasmids
  in K. pneumonia
• Substrate hydrolysis
  spectrum includes
  cephalosporins and
  carbapenems
      Dr.T.V.Rao MD             51
Consequences of Antibiotic drug
            Resistance
• People infected with drug-resistant organisms
  are more likely to have longer and more
  expensive hospital stays, and may be more
  likely to die as a result of the infection. They
  require treatment with second- or third-
  choice drugs that may be less effective, more
  toxic, and more expensive. This means that
  patients with an antimicrobial-resistant
  infection may suffer more and pay more for
  treatment. (Issues with Insurance)
                      Dr.T.V.Rao MD              52
Emerging Trends in Antibiotic
         Resistance
• Reports of methicillin-resistant
  Staphylococcus aureus (MRSA)—a
  potentially dangerous type of staph bacteria
  that is resistant to certain antibiotics and
  may cause skin and other infections—in
  persons with no links to healthcare systems
  have been observed with increasing
  frequency in the United States and
  elsewhere around the globe.

                     Dr.T.V.Rao MD               53
Gram negative bacteria a great threat
                         • Multi-drug resistant
                           Klebsiella species
                           and Escherichia coli
                           have been isolated
                           in hospitals
                           throughout the
                           United States.
                         • It is a Universal
                           phenomenon

                Dr.T.V.Rao MD                 54
WHAT NEXT
• Indian hospitals have reported very high
  Gram-negative resistance rates, with very high
  prevalence of ESBL (Extended Spectrum Beta
  Lactamases) producers and also high
  carbapenem resistance rates. Increasing
  carbapenem resistance will invariably result in
  increased usage of colistin, currently the last
  line of defence, with a potential for colistin-
  resistant and Pan Drug Resistant bacterial
  infections.         Dr.T.V.Rao MD             55
Fungi too becoming resistant
• Antimicrobial
  resistance is
  emerging among
  some fungi,
  particularly those
  fungi that cause
  infections in
  transplant patients
  with weakened
  immune systems.       Dr.T.V.Rao MD   56
Resistance in Virus
                • Antimicrobial
                  resistance has also
                  been noted with
                  some of the drugs
                  used to treat human
                  immunodeficiency
                  virus (HIV) infections
                  and influenza.

       Dr.T.V.Rao MD                   57
Parasites too are Problematic
• The development of
  antimicrobial resistance to
  the drugs used to treat
  malaria infections has been
  a continuing problem in
  many parts of the world for
  decades. Antimicrobial
  resistance has developed to
  a variety of other parasites
  that cause infection.

•
                            Dr.T.V.Rao MD   58
Identification of The Etiological
                Agent
           Laboratory diagnosis
 Interpretation of the report
 What is isolated is not necessarily the
  pathogen
 Was the specimen properly collected ?
 Is it a contaminant or colonizer ?
 Sensitivity reports are at best a guide
                    Dr.T.V.Rao MD           59
Limitations of combination of antibiotics
• The role of combination
  antimicrobial therapy for
  the prevention of resistance
  is limited to those situations
  in which there is
 A high organism load
 A high frequency of
  mutational resistance
  during therapy.
• Classic examples are
  tuberculosis or HIV
  infection.



                               Dr.T.V.Rao MD   60
Problems With Improper Use of
           Antibiotics

• They don’t help the patient at all
• Expense: 75% of outpatient antibiotics are used for
  respiratory infections
• Patient expectations: why no better?
• Side effects: diarrhea, rash, allergy
• Development of resistance: the antibiotic
  won’t work when you really DO need it for a
  bacterial infection
                        Dr.T.V.Rao MD                   61
WHO global strategy on reducing the
          antibiotic resistance
• The WHO Global Strategy for
  Containment of Antimicrobial
  Resistance identifies the
  establishment and support of
  microbiology laboratories as a
  fundamental priority in guiding
  and assessing intervention
  efforts.       Dr.T.V.Rao MD          62
Importance of local antibiotic
         Resistance data
 Resistance patterns vary
   From country to country
   From hospital to hospital in the same
    country
   From unit to unit in the same hospital
 Regional/Country data useful only
  for looking at trends NOT guide
  empirical therapy
                     Dr.T.V.Rao MD           63
Streamlining or De-Escalation
          of Therapy
–On the basis of culture and sensitivity
 reports we can more effectively target
 the causative pathogens, by elimination
 of redundant combination therapy
–Resulting in decreased Ab exposure and
 substantial cost savings

                  Dr.T.V.Rao MD            64
Continuous Medical Education
•   Training and educating
                           a Must ..
    health care professionals on
    the appropriate use of
    antibiotics must include
    appropriate selection,
    dosing, route, and duration
    of antibiotic therapy. To
    ensure that training and
    education is working, there
    should be extensive
    collaboration between the
    antibiotic stewardship and
    hospital infection prevention
    and control teams.
                                Dr.T.V.Rao MD   65
Antibiotic Pressure and Resistance in Bacteria
   What factors promote their development and spread ?




 Alteration of normal flora
 Practices contributing to misuse of antibiotics
 Settings that foster drug resistance
 Failure to follow infection control principles
                      Dr.T.V.Rao MD                      66
Practices Contributing to
      Misuse of Antibiotics

   Inappropriate specimen selection and

    collection

   Inappropriate clinical tests

   Failure to use stains/smears

   Failure to use cultures and susceptibility tests

                     Dr.T.V.Rao MD                     67
Settings that Foster Drug Resistance

 Hospital
    Intensive care units
    Oncology units
    Dialysis units
    Rehab units
    Transplant units
    Burn units
                      Dr.T.V.Rao MD   68
What Is Antimicrobial Stewardship?

• A combination of infection control and antimicrobial
management
• Mandatory infection control compliance
• Selection of antimicrobials from each class of drugs that does
the least collateral damage
• Collateral damage issues include
– MRSA
– ESBLs
– C difficile
– Stable derepression
– MBLs and other carbapenemases
– VRE
• Appropriate de-escalation when culture results are available
Dellit TH, et al. Clin Infect Dis. 2007;44:159-177.
                              Dr.T.V.Rao MD                        69
IDSA Guidelines – Definition of
        Antimicrobial Stewardship
• Antimicrobial   stewardship is an activity that
promotes

– The appropriate selection of antimicrobials

– The appropriate dosing of antimicrobials

– The appropriate route and duration of
antimicrobial therapy

                          Dr.T.V.Rao MD             70
The Primary Goal of
           Antimicrobial Stewardship
• The primary goal of antimicrobial stewardship is to

– Optimize clinical outcomes while minimizing unintended
consequences of antimicrobial use

• Unintended consequences include the following
– Toxicity

– The selection of pathogenic organisms, such as C difficile

– The emergence of resistant pathogens




                                   Dr.T.V.Rao MD               71
Practices Contributing to
      Misuse of Antibiotics

   Inappropriate specimen selection and collection

   Inappropriate clinical tests

   Failure to use stains/smears

   Failure to use cultures and susceptibility tests



                     Dr.T.V.Rao MD                     72
Identification of The Etiological
                Agent
           Laboratory diagnosis
 Interpretation of the report
 What is isolated is not necessarily the
  pathogen
 Was the specimen properly collected ?
 Is it a contaminant or colonizer ?
 Sensitivity reports are at best a guide
Implementation of WHONET CAN HELP TO MONITOR
                   RESISTANCE

                              • Legacy computer
                                systems, quality
                                improvement teams, and
                                strategies for optimizing
                                antibiotic use have the
                                potential to stabilize
                                resistance and reduce
                                costs by encouraging
                                heterogeneous
                                prescribing patterns and
                                use of local susceptibility
                                patterns to inform
                                empiric treatment.
                   Dr.T.V.Rao MD                              74
Growing importance of
                   WHONET
• World over antimicrobial
  resistance is a major
  public health problem.
  The WHONET software
  program puts each
  laboratory data into a
  common code and file
  format, which can be
  merged for national or
  global collaboration of
  antimicrobial resistance
  surveillance

                         Dr.T.V.Rao MD   75
Whonet helps us in ……
• The understanding of the
  local epidemiology of
  microbial populations;
  the selection of
  antimicrobial agents; the
  identification of hospital
  and community
  outbreaks; and the
  recognition of quality
  assurance problems in
  laboratory testing.

                          Dr.T.V.Rao MD   76
Drugs Under Development
       PRSP, MRSA,VISA,VRE
• Lipopetides (Daptomycin: narrow
  therapeutic index)
• Glycyclines
• Glycopeptides (Vancomycin analogues)
• Fluoroquinolones
• Macrolides/Ketolides
• Evernimicin (trials on hold)
                  Dr.T.V.Rao MD          77
Physicians Can Impact
                                 Other clinicians

Patients




Optimize patient evaluation        Optimize consultations with
Adopt judicious antibiotic         other clinicians
prescribing practices              Use infection control measures
Immunize patients                  Educate others about judicious
                                   use of antibiotics
                        Dr.T.V.Rao MD                          78
A good clinical practice saves antibiotics
• Treatment should be
  limited to bacterial
  infections, using
  antibiotics directed
  against the causative
  agent, given in optimal
  dosage, interval and
  length of treatment, with
  steps taken to ensure
  maximum patient
  compliance with the
  treatment regimen and
  only when the benefit of
  treatment outweighs the Dr.T.V.Rao MD      79
Continuous Medical Education a Must
                ..
• Training and educating health
  care professionals on the
  appropriate use of antibiotics
  must include appropriate
  selection, dosing, route, and
  duration of antibiotic therapy.
  To ensure that training and
  education is working, there
  should be extensive
  collaboration between the
  antibiotic stewardship and
  hospital infection prevention
  and control teams



                                    Dr.T.V.Rao MD   80
Chennai Declaration
• The Chennai Declaration wants India to take
  urgent initiatives to formulate an effective
  national policy to control the rising trend of
  antimicrobial resistance and to ban on over-the-
  counter sale of antibiotics.
• Chennai: ‘The Chennai Declaration: A roadmap to
  tackle the challenge of antimicrobial resistance’
  published in the latest edition of Indian Journal of
  Cancer has recommended to make it mandatory
  to set up an Infection Control Team (ICT) in all
  hospitals.

                        Dr.T.V.Rao MD                81
Educating the Educated
• The recommendations include offering Post-
  MD/DNB (internal medicine) sub-specialisation in
  Infectious Diseases at all post-graduate centres
  that offer sub-speciality training, compulsory
  training in infection control and infectious
  diseases training in under-graduate and post
  graduate curriculum in all specialities. The
  Medical Council of India should introduce one-
  week antibiotic stewardship and infection control
  training in the third, fourth and final year of
  MBBS and two-week training at the PG level.

                       Dr.T.V.Rao MD              82
Creating a Task force
• Recommending the setting up of a National
  Task Force to guide and supervise the regional
  and State infection control committees, the
  paper suggests that the National Accreditation
  Board for Hospitals & Healthcare Providers
  (NABH) insist on strict implementation of
  hospital antibiotic and infection control policy,
  during hospital accreditation and re-
  accreditation processes.
                      Dr.T.V.Rao MD               83
Are we overusing Antibiotics




  Dr.T.V.Rao MD                84
Good hand washing practices still reduces
    antibiotic resistance and spread




                  Dr.T.V.Rao MD             85
Conclusions
 Antibiotic resistance is a major
  problem world-wide
 Resistance is inevitable with use
 No new class of antibiotic introduced
  over the last two decades
   Appropriate use is the only way of
     prolonging the useful life of an
                 antibiotic
                 Dr.T.V.Rao MD            86
Antibiotics save Lives
Save Antibiotics from Misuse




            Dr.T.V.Rao MD      87
Dr.T.V.Rao MD   88

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Rationalism of antibiotic therapy copy

  • 2. Fleming and Penicillin Dr.T.V.Rao MD 2
  • 3. Self Medication • The greatest possibility of evil in self- medication is the use of too small doses so that instead of clearing up infection, the microbes are educated to resist penicillin and a host of penicillin-fast organisms is bread out which can be passed to other individuals and from them to other until they reach someone who gets a septicemia or a pneumonia which penicillin cannot save. Sir AlexanderFlemming Dr.T.V.Rao MD 3
  • 4. Antibiotic brands • 50 penicillin's • 9 macrolides • 71 cephalosporins • 2 streptogramins • 12 tetracycline's • 3 dihydrofolate • 8 aminoglycosides reductase • 1 monobactam inhibitors • 5 Carbapenems • 1 oxazolidinone • 5.5 quinolones Dr.T.V.Rao MD 4
  • 5. Evolution of Enzymes Plasmid-Mediated TEM and SHV b-Lactamase Third-Generation Ampicillin Cephalosporins 1965 1970s 1980s 1987 2000 1983 1963 TEM-1 TEM-1 ESBL >120 ESBLs Reported in ESBL in E coli in Worldwide 28 Gram- Europe S paratyphi United Negative States Species Dr.T.V.Rao MD 5
  • 6. Development of anti-microbials ertapenem tigecyclin The development daptomicin linezolid of anti-infectives … telithromicin quinup./dalfop. cefepime ciprofloxacin aztreonam norfloxacin imipenem cefotaxime clavulanic ac. cefuroxime gentamicin cefalotina nalidíxico ac. ampicillin methicilin vancomicin rifampin chlortetracyclin streptomycin pencillin G prontosil 1920 1930 1940 1950 1960 Dr.T.V.Rao MD 1970 1980 1990 2000 6
  • 7. 1962 and 2000, no major classes of antibiotics were introduced Fischbach MA and Walsh CT Science 2009 Dr.T.V.Rao MD 7
  • 8. A Changing Landscape for Numbers of Approved Antibacterial Agents 18 16 Number of agents approved 14 12 Resistance 10 8 6 4 2 0 0 1983-87 1988-92 1993-97 1998-02 2003-05 2008 Bars represent number of new antimicrobial agents approved by the FDA during the period listed. Infectious Diseases Society of America. Bad Bugs, No Drugs. July 2004; Spellberg B et al. Clin Infect Dis. 2004;38:1279-1286; New antimicrobial agents. Antimicrob Agents Chemother. 2006;50:1912
  • 10. Antibiotics • Biology and Society About 50% of the antibiotics produced today are used in the livestock industry. What impact does this have on the treatment of human diseases? Dr.T.V.Rao MD 10
  • 11. ANTIMICROBIAL RESISTANCE: The role of animal feed antibiotic additives • 48% of all antibiotics by weight is added to animal feeds to promote growth. Results in low, sub therapeutic levels which are thought to promote resistance. • Farm families who own chickens feed tetracycline have an increased incidence of tetracycline resistant fecal flora Dr.T.V.Rao MD 11
  • 12. Prescribing an antibiotic  Is an antibiotic necessary ?  What is the most appropriate antibiotic ?  What dose, frequency, route and duration ?  Is the treatment effective ? Dr.T.V.Rao MD 12
  • 13. How are antibiotics overused or Misused? • Seven out of ten Americans receive antibiotics when they seek treatment for a common cold! Only one-third of patients use antibiotics the way doctors tell them. • This allows bacteria to become resistant by not killing them completely. Dr.T.V.Rao MD 13
  • 14. Antibiotic Prescribing Children are real Concern • Antibiotics were prescribed in 68% of acute respiratory tract visits – and of those, 80% were unnecessary according to CDC guidelines • Children are of particular concern because they have the highest rates of Dr.T.V.Rao MD 14 antibiotic use.
  • 15. We too Contribute for Creating Drug Resistance • Every time a person takes antibiotics, sensitive bacteria are killed, but resistant microbes may be left to grow and multiply. Repeated and improper uses of antibiotics are primary causes of the increase in drug- resistant bacteria. Dr.T.V.Rao MD 15
  • 16. The consequences of antibiotic resistance • Increased morbidity & mortality – “best-guess” therapy may fail with the patient’s condition deteriorating before susceptibility results are available – no antibiotics left to treat certain infections • Greater health care costs – more investigations – more expensive, toxic antimicrobials required – expensive barrier nursing, isolation, procedures, etc. • Therapy priced out of the reach of some third-world countries 16 Dr.T.V.Rao MD
  • 17. Costs Associated with Increased Bacterial Resistance • ↑Treatment failures • ↑Morbidity and mortality • ↑Risk of hospitalization • ↑Length of hospital stays • ↑Need for expensive and broad spectrum antibiotics Dr.T.V.Rao MD 17
  • 18. Social factors fuelling resistance • Poverty encourages the development of resistance through under use of drugs – Patients unable to afford the full course of the medicines – Sub-standard & counterfeit drugs lack potency • Globalization, increased travel and trade ensure that resistant strains quickly travel elsewhere. So does excessive 18 promotion. Dr.T.V.Rao MD
  • 19. Developed countries Overuse • In wealthy countries, resistance is emerging for the opposite reason – the overuse of drugs. • Unnecessary demands for drugs by patients are often eagerly met by health services and stimulated by pharmaceutical promotion • Overuse of antimicrobials in food production is also contributing to increased drug resistance. Dr.T.V.Rao MD 19
  • 20. Classification of Pencillins • Natural Benzyl penicillin Phenoxymethyl penicillin Penicillin v Semi synthetic and pencillase resistant 1 Methicillin 2 Nafcillin 3 Cloxacillin 4 Oxacillin 5 Floxacillin Dr.T.V.Rao MD 20
  • 21. Macrolides,Azalides,Ketolides • Contain macro cyclic lactone ring Erythromycin. Is popularly used drug • Other drugs Roxithromycin,Azithromy cin • Inhibits the protein synthesis. • Used as alternative to pencillin allergy patients. Dr.T.V.Rao MD 21
  • 23. Cephalosporins • Like penicillin acts similar • Products of the molds of genus Cephalosporium except cefoxilin • Divided into 4 generation of Cephalosporins depending on the spectrum of activity. Dr.T.V.Rao MD 23
  • 24. Major generations of Cephalosporins • Cephalosporins are divided into 3 generations: • 1st generation: Cephalexin, cefadroxil, cephradine • 2nd generation: Cefuroxime, cofactor • 3rd generation: cefotaxime, Ceftazidime, cefepime - these give the best CNS penetration • 4th generation Cephalosporins are already available Dr.T.V.Rao MD 24
  • 25. Different Generations of Cephalosporins • Cephalosporins are grouped into "generations" based on their spectrum of antimicrobial activity. The first Cephalosporins were designated first generation while later, more extended spectrum Cephalosporins were classified as second generation Cephalosporins. Dr.T.V.Rao MD 25
  • 26. 5th Generation Cephalosporins • Ceftaroline is a new intravenous (IV) cephalosporin that was FDA-approved October 2010. It is labelled for the treatment of adults with infections caused by susceptible bacteria, specifically skin and skin structure infections (SSSIs) caused by methicillin- sensitive Dr.T.V.Rao MD 26
  • 27. 5th Generation Cephalosporins • Staphylococcus aureus (MSSA), methicillin- resistant S aureus (MRSA), Streptococcus pyogenes, Streptococcus agalactiae, Escherichia coli, Klebsiella pneumoniae, or Klebsiella oxytoca; and community acquired pneumonia (CAP) caused by Streptococcus pneumoniae (with or without concurrent bacteraemia), MSSA, E coli, Haemophilus influenza, K.pneumoniae, or K oxytoca Dr.T.V.Rao MD 27
  • 28. Ceftaroline is effective … • Ceftaroline is a fifth generation cephalosporin with excellent activity against GPCs including MRSA & DRSP Affinity for all PBPs including PBP 2’ and PBP 2X Not ESBL stable, Not active against Non fermenters Dr.T.V.Rao MD 28
  • 29. Irrational Use of Third Generation Cephalosporins • Several studies have demonstrated that patterns of antibiotic usage greatly affect the number of resistant organisms which develop. Overuse of broad- spectrum antibiotics, such as second- and third- generation Cephalosporins, generate resistant strains. Dr.T.V.Rao MD 29
  • 30. Advantages with Newer generations • Each newer generation of cephalosporins has significantly greater gram-negative antimicrobial properties than the preceding generation, in most cases with decreased activity against gram-positive organisms. Fourth generation cephalosporins, however, have true broad spectrum activity Dr.T.V.Rao MD 30
  • 31. Other Beta-lactams include • Other beta-lactams include: • Aztreonam: a monocytic beta- lactam, with an antibacterial spectrum which is active only against Gram negative aerobes, including Pseudomonas aeruginosa, Neisseria meningitides and N. gonorrhoea. Dr.T.V.Rao MD 31
  • 32. How are Carbapenems Used? Uses by Clinical Syndrome Use by Clinical Isolate • Bacterial meningitis  Acinetobacter spp.  Pseudomonas aeruginosa • Hospital-associated  Alcaligenes spp. sinusitis  Enterobacteriaceae • Sepsis of unknown origin  Mogenella spp. • Hospital-associated  Serratia spp. pneumonia  Enterobacter spp.  Citrobacter spp.  ESBL or AmpC + E. coli and Klebsiella spp. Reference: Sanford Guide MD Dr.T.V.Rao 32
  • 33. Spectrum of Activity Strep spp. & Entero- Non- Drug Anaerobes MSSA bacteriaeae fermentors Imipenem + + + + Meropenem + + + + Limited Ertapenem + + activity + Doripenem + + + +
  • 34. Emerging Carbapenem Resistance in Gram-Negative Bacilli • Significantly limits treatment options for life-threatening infections • No new drugs for gram-negative bacilli • Emerging resistance mechanisms, carbapenemases are mobile, • Detection of carbapenemases and implementation of infection control practices are necessary to limit spread Dr.T.V.Rao MD 34
  • 35. Daptomycin (Cubicin®) • New drug class (lipopeptide) • Rapidly bactericidal • New mechanism of action: acts by binding to cell membrane and disrupting the cell membrane potential • No cross resistance • Dose: 4-6 mg/kg once daily
  • 36. Other drugs • Imipenem: a carbapenem with a broader spectrum of activity against Gram positive and negative aerobes and anaerobes. Needs to be given with cilastatin to prevent inactivation by the kidney. Dr.T.V.Rao MD 36
  • 37. Quinolones • Quinolones are the first wholly synthetic antimicrobials. The commonly used Quinolones. • Act on the DNA gyrase which prevents DNA polymerase from proceeding at the replication fork and consequently stopping synthesis. Dr.T.V.Rao MD 37
  • 38. Aminoglycosides • Aminoglycosides are group of antibiotics in which amino sugars liked by glycoside bonds • Eg Streptomycin, • Act at the level of Ribosome's and inhibits protein synthesis • Other Aminoglycosides – Gentamycin, neomycins,paromomycins,tobr amycins Kanamycins and spectinomycins Dr.T.V.Rao MD 38
  • 40. Tetracycline's • Broad spectrum antibiotic produced by Streptomyces species • 1. Oxytetracycle, chlortetracycle and tetracycline • Tetracyclnes are bacteriostatic drugs inhibits rapidly multiplying organisms • Resistance develops slowly and attributed to alterations in cell membrane permeability to enzymatic inactivation of the drug Dr.T.V.Rao MD 40
  • 41. Other Antimicrobial agents • Lincomycins Clindamycin resembles Macrolides in biting site and antimicrobial activity. Streptogramins Quinpristin / dalfopristin useful in gram positive bacteria Dr.T.V.Rao MD 41
  • 42. Antibiotics in Anaerobes • Major anaerobes – Anaerobic cocci, clostridia and Bactericides are susceptible to Benzyl pencillin • Bact.fragilis as well as many other anaerobes are treatable with Erythromycin,Lincomycin, tetracycline and Chloramphenicol • Clindamycin is effective against many strains of Bacteroides Dr.T.V.Rao MD 42
  • 43. Metronidazole in Anaerobic Infections • Since the discovery of Metronidazole in 1973 since then it was identified as leading agent anaerobes. • But also useful in treating parasitic infections Trichomonas, Amoebiasis and other protozoan infections. Dr.T.V.Rao MD 43
  • 44. Treatment of N. gonorrhoea • Only current CDC-recommended options for treating N. gonorrhoea infections are from a single class of antibiotics, the cephalosporins. – Ceftriaxone, available only as an injection, is the recommended treatment for all types of gonorrhea infections (i.e., urogenital, rectal, and pharyngeal). – Cefixime is the only oral agent recommended for treatment of uncomplicated urogenital or rectal gonorrhea Reduced susceptibility to cefixime being described in Japan and other countries
  • 45. Drug Resistance • In spite discovery of several antibiotics several microorganisms attained resistance. • The major factor contributing to persistence of infectious disease has been the tremendous capacity of microorganisms for circumventing the action of inhibitory drugs. • The drug resistance continues to be a threat for usefulness of the chemotherapeutic agents. Dr.T.V.Rao MD 45
  • 46. Inappropriate Antibiotic Use  Use of antibiotics with no clinical indication (eg, for viral infections)  Use of broad spectrum antibiotics when not indicated  Inappropriate choice of empiric antibiotics Dr.T.V.Rao MD 46
  • 47. Multi Drug resistant pathogens • If a bacterium carries several resistance genes, it is called multiresistant or, informally, a superbug. The term antimicrobial resistance is sometimes use to explicitly encompass organisms other than bacteria MD Dr.T.V.Rao 47
  • 48. Extended-Spectrum β-Lactamases • β-lactamases capable of conferring bacterial resistance to – the penicillins – first-, second-, and third-generation cephalosporins – aztreonam – (but not the cephamycins or carbapenems) • These enzymes are derived from group 2b β-lactamases (TEM-1, TEM-2, and SHV-1) – differ from their progenitors by as few as one AA Dr.T.V.Rao MD 48
  • 49. Antibiotic Resistance Threat to Humans and Animals • Antibiotic resistance has become a serious problem in both developed and underdeveloped nations. By 1984 half of those with active tuberculosis in the United States had a strain that resisted at least one antibiotic. In certain settings, such as hospitals and some childcare location Dr.T.V.Rao MD 49
  • 50. Carbapenemases • Ability to hydrolyze penicillins, cephalosporins, monobactams, and carbapenems • Resilient against inhibition by all commercially viable ß- lactamase inhibitors – Subgroup 2df: OXA (23 and 48) carbapenemases – Subgroup 2f : serine carbapenemases from molecular class A: GES and KPC – Subgroup 3b contains a smaller group of MBLs that preferentially hydrolyze carbapenems • IMP and VIM enzymes that have appeared globally, most frequently in non-fermentative bacteria but also in Enterobacteriaceae Dr.T.V.Rao MD 50
  • 51. K. pneumonia carbapenemases) • KPCs are the most prevalent of this group of enzymes, found mostly on transferable plasmids in K. pneumonia • Substrate hydrolysis spectrum includes cephalosporins and carbapenems Dr.T.V.Rao MD 51
  • 52. Consequences of Antibiotic drug Resistance • People infected with drug-resistant organisms are more likely to have longer and more expensive hospital stays, and may be more likely to die as a result of the infection. They require treatment with second- or third- choice drugs that may be less effective, more toxic, and more expensive. This means that patients with an antimicrobial-resistant infection may suffer more and pay more for treatment. (Issues with Insurance) Dr.T.V.Rao MD 52
  • 53. Emerging Trends in Antibiotic Resistance • Reports of methicillin-resistant Staphylococcus aureus (MRSA)—a potentially dangerous type of staph bacteria that is resistant to certain antibiotics and may cause skin and other infections—in persons with no links to healthcare systems have been observed with increasing frequency in the United States and elsewhere around the globe. Dr.T.V.Rao MD 53
  • 54. Gram negative bacteria a great threat • Multi-drug resistant Klebsiella species and Escherichia coli have been isolated in hospitals throughout the United States. • It is a Universal phenomenon Dr.T.V.Rao MD 54
  • 55. WHAT NEXT • Indian hospitals have reported very high Gram-negative resistance rates, with very high prevalence of ESBL (Extended Spectrum Beta Lactamases) producers and also high carbapenem resistance rates. Increasing carbapenem resistance will invariably result in increased usage of colistin, currently the last line of defence, with a potential for colistin- resistant and Pan Drug Resistant bacterial infections. Dr.T.V.Rao MD 55
  • 56. Fungi too becoming resistant • Antimicrobial resistance is emerging among some fungi, particularly those fungi that cause infections in transplant patients with weakened immune systems. Dr.T.V.Rao MD 56
  • 57. Resistance in Virus • Antimicrobial resistance has also been noted with some of the drugs used to treat human immunodeficiency virus (HIV) infections and influenza. Dr.T.V.Rao MD 57
  • 58. Parasites too are Problematic • The development of antimicrobial resistance to the drugs used to treat malaria infections has been a continuing problem in many parts of the world for decades. Antimicrobial resistance has developed to a variety of other parasites that cause infection. • Dr.T.V.Rao MD 58
  • 59. Identification of The Etiological Agent  Laboratory diagnosis  Interpretation of the report  What is isolated is not necessarily the pathogen  Was the specimen properly collected ?  Is it a contaminant or colonizer ?  Sensitivity reports are at best a guide Dr.T.V.Rao MD 59
  • 60. Limitations of combination of antibiotics • The role of combination antimicrobial therapy for the prevention of resistance is limited to those situations in which there is  A high organism load  A high frequency of mutational resistance during therapy. • Classic examples are tuberculosis or HIV infection. Dr.T.V.Rao MD 60
  • 61. Problems With Improper Use of Antibiotics • They don’t help the patient at all • Expense: 75% of outpatient antibiotics are used for respiratory infections • Patient expectations: why no better? • Side effects: diarrhea, rash, allergy • Development of resistance: the antibiotic won’t work when you really DO need it for a bacterial infection Dr.T.V.Rao MD 61
  • 62. WHO global strategy on reducing the antibiotic resistance • The WHO Global Strategy for Containment of Antimicrobial Resistance identifies the establishment and support of microbiology laboratories as a fundamental priority in guiding and assessing intervention efforts. Dr.T.V.Rao MD 62
  • 63. Importance of local antibiotic Resistance data  Resistance patterns vary  From country to country  From hospital to hospital in the same country  From unit to unit in the same hospital  Regional/Country data useful only for looking at trends NOT guide empirical therapy Dr.T.V.Rao MD 63
  • 64. Streamlining or De-Escalation of Therapy –On the basis of culture and sensitivity reports we can more effectively target the causative pathogens, by elimination of redundant combination therapy –Resulting in decreased Ab exposure and substantial cost savings Dr.T.V.Rao MD 64
  • 65. Continuous Medical Education • Training and educating a Must .. health care professionals on the appropriate use of antibiotics must include appropriate selection, dosing, route, and duration of antibiotic therapy. To ensure that training and education is working, there should be extensive collaboration between the antibiotic stewardship and hospital infection prevention and control teams. Dr.T.V.Rao MD 65
  • 66. Antibiotic Pressure and Resistance in Bacteria What factors promote their development and spread ?  Alteration of normal flora  Practices contributing to misuse of antibiotics  Settings that foster drug resistance  Failure to follow infection control principles Dr.T.V.Rao MD 66
  • 67. Practices Contributing to Misuse of Antibiotics  Inappropriate specimen selection and collection  Inappropriate clinical tests  Failure to use stains/smears  Failure to use cultures and susceptibility tests Dr.T.V.Rao MD 67
  • 68. Settings that Foster Drug Resistance Hospital  Intensive care units  Oncology units  Dialysis units  Rehab units  Transplant units  Burn units Dr.T.V.Rao MD 68
  • 69. What Is Antimicrobial Stewardship? • A combination of infection control and antimicrobial management • Mandatory infection control compliance • Selection of antimicrobials from each class of drugs that does the least collateral damage • Collateral damage issues include – MRSA – ESBLs – C difficile – Stable derepression – MBLs and other carbapenemases – VRE • Appropriate de-escalation when culture results are available Dellit TH, et al. Clin Infect Dis. 2007;44:159-177. Dr.T.V.Rao MD 69
  • 70. IDSA Guidelines – Definition of Antimicrobial Stewardship • Antimicrobial stewardship is an activity that promotes – The appropriate selection of antimicrobials – The appropriate dosing of antimicrobials – The appropriate route and duration of antimicrobial therapy Dr.T.V.Rao MD 70
  • 71. The Primary Goal of Antimicrobial Stewardship • The primary goal of antimicrobial stewardship is to – Optimize clinical outcomes while minimizing unintended consequences of antimicrobial use • Unintended consequences include the following – Toxicity – The selection of pathogenic organisms, such as C difficile – The emergence of resistant pathogens Dr.T.V.Rao MD 71
  • 72. Practices Contributing to Misuse of Antibiotics  Inappropriate specimen selection and collection  Inappropriate clinical tests  Failure to use stains/smears  Failure to use cultures and susceptibility tests Dr.T.V.Rao MD 72
  • 73. Identification of The Etiological Agent  Laboratory diagnosis  Interpretation of the report  What is isolated is not necessarily the pathogen  Was the specimen properly collected ?  Is it a contaminant or colonizer ?  Sensitivity reports are at best a guide
  • 74. Implementation of WHONET CAN HELP TO MONITOR RESISTANCE • Legacy computer systems, quality improvement teams, and strategies for optimizing antibiotic use have the potential to stabilize resistance and reduce costs by encouraging heterogeneous prescribing patterns and use of local susceptibility patterns to inform empiric treatment. Dr.T.V.Rao MD 74
  • 75. Growing importance of WHONET • World over antimicrobial resistance is a major public health problem. The WHONET software program puts each laboratory data into a common code and file format, which can be merged for national or global collaboration of antimicrobial resistance surveillance Dr.T.V.Rao MD 75
  • 76. Whonet helps us in …… • The understanding of the local epidemiology of microbial populations; the selection of antimicrobial agents; the identification of hospital and community outbreaks; and the recognition of quality assurance problems in laboratory testing. Dr.T.V.Rao MD 76
  • 77. Drugs Under Development PRSP, MRSA,VISA,VRE • Lipopetides (Daptomycin: narrow therapeutic index) • Glycyclines • Glycopeptides (Vancomycin analogues) • Fluoroquinolones • Macrolides/Ketolides • Evernimicin (trials on hold) Dr.T.V.Rao MD 77
  • 78. Physicians Can Impact Other clinicians Patients Optimize patient evaluation Optimize consultations with Adopt judicious antibiotic other clinicians prescribing practices Use infection control measures Immunize patients Educate others about judicious use of antibiotics Dr.T.V.Rao MD 78
  • 79. A good clinical practice saves antibiotics • Treatment should be limited to bacterial infections, using antibiotics directed against the causative agent, given in optimal dosage, interval and length of treatment, with steps taken to ensure maximum patient compliance with the treatment regimen and only when the benefit of treatment outweighs the Dr.T.V.Rao MD 79
  • 80. Continuous Medical Education a Must .. • Training and educating health care professionals on the appropriate use of antibiotics must include appropriate selection, dosing, route, and duration of antibiotic therapy. To ensure that training and education is working, there should be extensive collaboration between the antibiotic stewardship and hospital infection prevention and control teams Dr.T.V.Rao MD 80
  • 81. Chennai Declaration • The Chennai Declaration wants India to take urgent initiatives to formulate an effective national policy to control the rising trend of antimicrobial resistance and to ban on over-the- counter sale of antibiotics. • Chennai: ‘The Chennai Declaration: A roadmap to tackle the challenge of antimicrobial resistance’ published in the latest edition of Indian Journal of Cancer has recommended to make it mandatory to set up an Infection Control Team (ICT) in all hospitals. Dr.T.V.Rao MD 81
  • 82. Educating the Educated • The recommendations include offering Post- MD/DNB (internal medicine) sub-specialisation in Infectious Diseases at all post-graduate centres that offer sub-speciality training, compulsory training in infection control and infectious diseases training in under-graduate and post graduate curriculum in all specialities. The Medical Council of India should introduce one- week antibiotic stewardship and infection control training in the third, fourth and final year of MBBS and two-week training at the PG level. Dr.T.V.Rao MD 82
  • 83. Creating a Task force • Recommending the setting up of a National Task Force to guide and supervise the regional and State infection control committees, the paper suggests that the National Accreditation Board for Hospitals & Healthcare Providers (NABH) insist on strict implementation of hospital antibiotic and infection control policy, during hospital accreditation and re- accreditation processes. Dr.T.V.Rao MD 83
  • 84. Are we overusing Antibiotics Dr.T.V.Rao MD 84
  • 85. Good hand washing practices still reduces antibiotic resistance and spread Dr.T.V.Rao MD 85
  • 86. Conclusions  Antibiotic resistance is a major problem world-wide  Resistance is inevitable with use  No new class of antibiotic introduced over the last two decades  Appropriate use is the only way of prolonging the useful life of an antibiotic Dr.T.V.Rao MD 86
  • 87. Antibiotics save Lives Save Antibiotics from Misuse Dr.T.V.Rao MD 87