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By
Dr/Lamiaa Gamal
microbes

bacteria   viruses   fungi   parasites
normal flora       Bacteria that live on or in a child

pathogen           A germ that can cause a disease

                   Presence of a germ in or on you without
colonization
                   disease.

                   A germ causing an illness. Your body will
infection
                   react by making antibodies

intoxication       Illness due to a toxin made by a germ


latent infection   A germ (most often a virus) in a resting state


reactivation       The latent germ wakes up and reproduces

carrier            A child who is colonized but not sick

contagious         Able to spread the illness

incubation.        Time between infection and symptoms
How are illnesses and
         infestations spread?
• Airborne: Respiratory infections, chickenpox, hand/foot/
  mouth disease, measles, mumps, whooping cough and
  rubella.
• Fecal/oral:viral enteritis, E coli 0157:H7,Giardia,
  Cryptosporidiosis, Shigella, Salmonella or
  Hepatitis A.
• Blood/body fluids: HIV, Hepatitis B and Hepatitis
  C
• Direct Contact: Skin infections and infestations
  such as impetigo, lice, scabies, ringworm, and
  herpes simplex
Routine Practices
• Cover your mouth and nose with
 a tissue when you cough or sneeze.
• Teach children to sneeze or cough into the
  inner arm where the elbow flexes instead
  of sneezing or coughing into their hands
• Do not share personal items such as
  hairbrushes, hats, toothbrushes,
  facecloths, towels,cups, or bottles.
• Wear disposable gloves anytime your hands may
  come into contact with blood or body fluid.
• Disinfect surfaces using a diluted bleach solution.
• Prepare food safely:
 Cook meat and poultry well.
 Avoid drinking or serving unpasteurized milk and
  juice.
 Thoroughly wash all fruits and vegetables before
  eating or serving.
 Keep uncooked meat away from fruit and
  vegetables.
Hand washing
• When to Wash Your Hands?
• How to Wash Your Hands?
Use regular soap that does not contain
  antibacterial agents.
Use of alcohol-based hand rubs
Fifth disease is caused by a virus, human parvovirus B19.
• It is sometimes called “slapped cheek” disease
because of the appearance of the rash.




 Flu-like symptoms (e.g., runny nose, sore throat, mild body weakness
    and joint pain, fever) may be present about 7 days before onset of
    rash
 Raised, red rash that first appears on child’s cheeks
 The lace-like rash spreads to the rest of the body after 1 – 4 days,
first on torso and arms, and then on to the rest of the child’s body
 After the rash fades, it may continue to re-appear for 1 – 3 weeks
when child is exposed to sunlight or heat (e.g., bathing).
• How is it spread?
Direct & indirect contact
Airborne
• Incubation period:
Usually 4 – 20 days from contact with
infected person
• When is the person contagious?
Usually for 7 – 10 days before onset
of rash
Once the rash appears, the child can
no longer pass it on to anyone else.
• How to prevent spread of the
   illness to other children.
Routine practices
No isolation
Measles is one of the most contagious communicable
diseases.
It is caused by the measles virus and is a leading cause of
vaccine preventable deaths in children worldwide.

 Fever, cough, runny nose, and watery inflamed eyes
 Small red spots with white or bluish white centers in the
  mouth
 Dusky red, blotchy rash that begins on the face and spreads
  all over the body
 Rash begins on 3rd to 7th day of illness and lasts 4 to 7 days
• A doctor may be able to diagnose measles based on a
  child’s symptoms
• How is it spread?
Airborne
Direct contact
• Incubation period:
Usually about 10 days.
• When is the person contagious?
From about 5 days before to 4 days after rash appears
• How to prevent spread of the illness to other children.
Exclude child from school, child care, and non-family contacts until 4 days
after the rash appears.
 Contact the local health unit.
 It is recommended that all contacts of a measles case who have not had
   measles disease or 2 doses of measles vaccine receive measles vaccine
   within 72 hours of last exposure to the infected child.
 All susceptible contacts should stay away from the child care facility or
   school until they have received one dose of measles vaccine or the
   Medical Health Officer states it is safe for them to return.
 Immune globulin is available to prevent measles disease in people who
   are exposed to a case of measles but who are unable to be immunized for
   any reason.
Routine practices
Infectious diseases in childhood
Mumps disease is caused by the mumps virus. Many children have mild or
no symptoms but they are still contagious to others. Adults are more likely
to experience complications than children.

 Fever
 Headache
 Swollen and painful salivary glands (found in front of and below the
ear or under the jaw)

 Meningitis (inflammation of the lining of the brain) in 20% of people
infected
 Orchitis (inflammation of the testicle) in 20-30% of post-pubertal males
 Oophoritis (inflammation of the ovary) in 5% of post-pubertal females
 Deafness and infertility occur occasionally.
• How is it spread?
Airborne
Direct & indirect contact
• Incubation period:
Usually 16 – 18 days from contact with an infected person but
can range from 14 – 25 days
• When is the person contagious?
Child is most contagious 2 days
 before to 4 days after the onset of
illness
• How to prevent spread of the illness
to other children.
Isolation for 9 days
Immunization
Routine practices
Infectious diseases in childhood
• Ringworm is a skin infection caused by a fungus. It can
  be found on the scalp, body, groin, or feet.


 Ring shaped rash that is reddish and may be itchy
 Rash may be dry and scaly or wet and crusty
 If ringworm infection is on the scalp, there may be
  patches of hair loss or hair thinning
• Scalp ringworm is very contagious, especially among
  children. It mainly affects children between 2 and 10
  years of age.
• Foot ringworm (athlete’s foot) affects males more than
  females and is more common after puberty. Symptoms
  of foot ringworm may include foot itching, rash or
  blisters on foot, and scaling of foot.
• How is it spread?
Direct contact
• Incubation period:
Usually 4 – 14 days
• When is the person contagious?
As long as lesions are present
• How to prevent spread of the infection to
  other children.
Exclude child from school or child care until child
has taken the first dose of prescribed
medication.
Routine practices
An acute disease caused by the rubella virus. An infection
with the rubella
virus gives lifelong immunity. Rubella is usually a mild
disease in children
and adults..
                                                   :
 Low-grade fever
 Malaise, tiredness
 Raised, red, pinpoint rash that starts on the face and
    spreads downwards
 Rash lasts 3 – 5 days
 50% of adolescents and adults with rubella develop
    muscle and joint pain
• Rubella infection during pregnancy can cause severe
    birth defects, miscarriage, or stillbirth. 85% of fetuses
    who are infected with rubella in the first 10 weeks of
    pregnancy will develop Congenital Rubella Syndrome
    (CRS). CRS may include deafness, eye problems, heart
    defects, liver, spleen, and brain damage.
• How is it spread?
Airborne
Direct & indirect contact
Infants with CRS can shed rubella virus in their nose and
throat secretions and urine for up to one year.
• Incubation period :
Usually 14 – 21 days from contact with an infected person
• When is the person contagious?
From 7 days before until 7 days after the onset of the rash.
A child with rubella is most infectious when the rash is
erupting.
• How to prevent spread of the illness to other children.
Exclude child from school or the child care facility for 7 days
after the onset of the rash
Immunization
Routine practices
Chickenpox is an infection caused by varicella-zoster
virus.

 Slight fever may be present before a rash develops.
 Rash usually first appears on body, face, and scalp. It
   then spreads
to limbs.
 Rash begins as small, red, flat spots that develop into
   itchy fluid filled blisters.
 After the blister breaks, open sores will crust over to
   form dry, brown scabs.
• Usually lasts for about 10 days.
• How is it spread?
Airborne
Direct contact
A pregnant woman
  with chickenpox can
  pass it on to her baby
  during pregnancy.
The virus does not live
  on objects like sheets,
  counters, or toys.
• Incubation period:
Usually 8 - 21 days from contact with an infected person
• When is the person contagious?
From 2 days before spots appear and until all blisters
have crusted over (which is usually 5 days after the first
blisters appear).
Child is most infectious 12 - 24 hours before the rash
appears.
• How to prevent spread of the illness to other
   children.
Routine practice
isolation
immunization
Hand, foot, and mouth disease is caused by a coxsackie virus. It
occurs mainly in the summer and early fall and is most common in
children under 10 years of age.
                          :
 Fever
 Sore throat
 Headache
 Small painful blisters inside the mouth on tongue and gums
   (last 4
to 6 days)
 Blisters may appear on the palms of child’s hands, on their
   fingers,
and on the soles of their feet for 7 to 10 days
• It is possible to have the infection and not have any symptoms.
• How is it spread?
Airborne
Touching infected child’s stool (e.g., assisting with toileting, changing a
diaper)
Touching objects (e.g., toys, tables, taps, door handles) contaminated
with the virus
• Incubation period:
Usually 3 – 6 days from contact with an infected person
• When is the person contagious?
During the stage of acute illness, usually for about 7 – 10 days. The
virus can be found in stool for 4 weeks after start of illness.
• How to prevent spread of the illness to other children.
No isolation
Routine practices
Impetigo is a common skin infection that is caused by group A
streptococcal (strep) or staphylococcus aureus (staph) bacteria.
 Infection starts when strep or staph bacteria enter the body through a
cut, insect bite, or scratch. It is most common in the summer.

 Clusters of red bumps or blisters surrounded by area of redness
 There may be fluid oozing out of the blisters and they may develop
a yellow (honey colored) or grey crust Sores usually appear around the
mouth and nose, and on skin not covered with clothes.
• Impetigo often affects school age children who live in crowded
   conditions, play sports, or have other skin conditions.
• How is it spread?
Direct & indirect contact
• Incubation period:
Staph bacteria: 4 – 10 days from contact with an infected person
Strep bacteria: 1 – 3 days from contact with an infected person
• When is the person contagious?
• As long as the rash continues to drain. After 24 hours of antibiotic
 treatment, a child with impetigo is no longer contagious.
• How to prevent spread of the illness
to other children.
Exclude child from school or child care until 24 hours
 after starting antibiotic treatment.
Routine practices
Pertussis is a very contagious respiratory illness caused by the bacteria,
Bordetella pertussis. It can cause serious illness in adults and children.
Infants under one year of age are at highest risk.

 Runny nose, low grade fever, and mild cough
 After 1 – 2 weeks, the cough worsens
 Child will cough violently and rapidly, over and over, until no air is
left in their lungs. Child will then inhale with characteristic “whooping”
sound
 Child will sometimes vomit after coughing
• Coughing will last for several weeks (will usually start to decrease
after about 6 weeks)
• How is it spread?
Airborne & indirect contact
• Incubation period:
Usually 7 – 10 days
• When is the person contagious?
Usually from the time when first symptoms develop (1 – 2 weeks before
severe coughing starts) until about 3 weeks after cough starts
• A child who is started on antibiotics is not infectious after 5 days of
    antibiotic therapy.
• How to prevent spread of the illness to other
 children.
Isolation: Five days from commencing antibiotic
 treatment, or 21 days from onset of illness if no
 antibiotic treatment
Antibiotics may be recommended for high risk,
close contacts of a child with pertussis
(i.e., infant under 1 year of age, pregnant woman in
 her third trimester) or when there is a high risk person
 in the household or child care facility.
immunization
Routine practices
Hepatitis A is an infection of the liver caused by the
Hepatitis A virus. It is usually mild and rarely causes
permanent liver damage.
Hepatitis A is usually more serious in adults than children.

 Fever
 Fatigue
 Loss of appetite, nausea, and vomiting
 Abdominal pain
 Jaundice (yellowing of the skin and eyes)
• Most infants and young children infected with hepatitis
  A have no symptoms
• How is it spread?
Hepatitis A virus is found in the stool of infected people. The virus is spread
through:
 Direct contact with the stool of an infected person
 Direct contact with the hands of an infected
person
 Direct contact with an object contaminated with the virus
 Eating food prepared by an infected person
 Drinking contaminated water
• Incubation period:
Usually 25 – 30 days (range is 15 – 50 days)
• When is the person contagious?
From about 14 days before onset of symptoms until about 7 days after onset
of jaundice. Infants and children may continue to shed virus in their stool for
up to 6 months.
• How to prevent spread of the illness to other children.
Isolation 7 days from onset of jaundice
Immunization or immune globulin
Routine practices
Infectious diseases in childhood
Infectious diseases in childhood

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Infectious diseases in childhood

  • 2. microbes bacteria viruses fungi parasites
  • 3. normal flora Bacteria that live on or in a child pathogen A germ that can cause a disease Presence of a germ in or on you without colonization disease. A germ causing an illness. Your body will infection react by making antibodies intoxication Illness due to a toxin made by a germ latent infection A germ (most often a virus) in a resting state reactivation The latent germ wakes up and reproduces carrier A child who is colonized but not sick contagious Able to spread the illness incubation. Time between infection and symptoms
  • 4. How are illnesses and infestations spread? • Airborne: Respiratory infections, chickenpox, hand/foot/ mouth disease, measles, mumps, whooping cough and rubella. • Fecal/oral:viral enteritis, E coli 0157:H7,Giardia, Cryptosporidiosis, Shigella, Salmonella or Hepatitis A. • Blood/body fluids: HIV, Hepatitis B and Hepatitis C • Direct Contact: Skin infections and infestations such as impetigo, lice, scabies, ringworm, and herpes simplex
  • 5. Routine Practices • Cover your mouth and nose with a tissue when you cough or sneeze. • Teach children to sneeze or cough into the inner arm where the elbow flexes instead of sneezing or coughing into their hands • Do not share personal items such as hairbrushes, hats, toothbrushes, facecloths, towels,cups, or bottles.
  • 6. • Wear disposable gloves anytime your hands may come into contact with blood or body fluid. • Disinfect surfaces using a diluted bleach solution. • Prepare food safely:  Cook meat and poultry well.  Avoid drinking or serving unpasteurized milk and juice.  Thoroughly wash all fruits and vegetables before eating or serving.  Keep uncooked meat away from fruit and vegetables.
  • 7. Hand washing • When to Wash Your Hands? • How to Wash Your Hands? Use regular soap that does not contain antibacterial agents. Use of alcohol-based hand rubs
  • 8. Fifth disease is caused by a virus, human parvovirus B19. • It is sometimes called “slapped cheek” disease because of the appearance of the rash.  Flu-like symptoms (e.g., runny nose, sore throat, mild body weakness and joint pain, fever) may be present about 7 days before onset of rash  Raised, red rash that first appears on child’s cheeks  The lace-like rash spreads to the rest of the body after 1 – 4 days, first on torso and arms, and then on to the rest of the child’s body  After the rash fades, it may continue to re-appear for 1 – 3 weeks when child is exposed to sunlight or heat (e.g., bathing).
  • 9. • How is it spread? Direct & indirect contact Airborne • Incubation period: Usually 4 – 20 days from contact with infected person • When is the person contagious? Usually for 7 – 10 days before onset of rash Once the rash appears, the child can no longer pass it on to anyone else. • How to prevent spread of the illness to other children. Routine practices No isolation
  • 10. Measles is one of the most contagious communicable diseases. It is caused by the measles virus and is a leading cause of vaccine preventable deaths in children worldwide.  Fever, cough, runny nose, and watery inflamed eyes  Small red spots with white or bluish white centers in the mouth  Dusky red, blotchy rash that begins on the face and spreads all over the body  Rash begins on 3rd to 7th day of illness and lasts 4 to 7 days • A doctor may be able to diagnose measles based on a child’s symptoms
  • 11. • How is it spread? Airborne Direct contact • Incubation period: Usually about 10 days. • When is the person contagious? From about 5 days before to 4 days after rash appears • How to prevent spread of the illness to other children. Exclude child from school, child care, and non-family contacts until 4 days after the rash appears.  Contact the local health unit.  It is recommended that all contacts of a measles case who have not had measles disease or 2 doses of measles vaccine receive measles vaccine within 72 hours of last exposure to the infected child.  All susceptible contacts should stay away from the child care facility or school until they have received one dose of measles vaccine or the Medical Health Officer states it is safe for them to return.  Immune globulin is available to prevent measles disease in people who are exposed to a case of measles but who are unable to be immunized for any reason. Routine practices
  • 13. Mumps disease is caused by the mumps virus. Many children have mild or no symptoms but they are still contagious to others. Adults are more likely to experience complications than children.  Fever  Headache  Swollen and painful salivary glands (found in front of and below the ear or under the jaw)  Meningitis (inflammation of the lining of the brain) in 20% of people infected  Orchitis (inflammation of the testicle) in 20-30% of post-pubertal males  Oophoritis (inflammation of the ovary) in 5% of post-pubertal females  Deafness and infertility occur occasionally.
  • 14. • How is it spread? Airborne Direct & indirect contact • Incubation period: Usually 16 – 18 days from contact with an infected person but can range from 14 – 25 days • When is the person contagious? Child is most contagious 2 days before to 4 days after the onset of illness • How to prevent spread of the illness to other children. Isolation for 9 days Immunization Routine practices
  • 16. • Ringworm is a skin infection caused by a fungus. It can be found on the scalp, body, groin, or feet.  Ring shaped rash that is reddish and may be itchy  Rash may be dry and scaly or wet and crusty  If ringworm infection is on the scalp, there may be patches of hair loss or hair thinning • Scalp ringworm is very contagious, especially among children. It mainly affects children between 2 and 10 years of age. • Foot ringworm (athlete’s foot) affects males more than females and is more common after puberty. Symptoms of foot ringworm may include foot itching, rash or blisters on foot, and scaling of foot.
  • 17. • How is it spread? Direct contact • Incubation period: Usually 4 – 14 days • When is the person contagious? As long as lesions are present • How to prevent spread of the infection to other children. Exclude child from school or child care until child has taken the first dose of prescribed medication. Routine practices
  • 18. An acute disease caused by the rubella virus. An infection with the rubella virus gives lifelong immunity. Rubella is usually a mild disease in children and adults.. :  Low-grade fever  Malaise, tiredness  Raised, red, pinpoint rash that starts on the face and spreads downwards  Rash lasts 3 – 5 days  50% of adolescents and adults with rubella develop muscle and joint pain • Rubella infection during pregnancy can cause severe birth defects, miscarriage, or stillbirth. 85% of fetuses who are infected with rubella in the first 10 weeks of pregnancy will develop Congenital Rubella Syndrome (CRS). CRS may include deafness, eye problems, heart defects, liver, spleen, and brain damage.
  • 19. • How is it spread? Airborne Direct & indirect contact Infants with CRS can shed rubella virus in their nose and throat secretions and urine for up to one year. • Incubation period : Usually 14 – 21 days from contact with an infected person • When is the person contagious? From 7 days before until 7 days after the onset of the rash. A child with rubella is most infectious when the rash is erupting. • How to prevent spread of the illness to other children. Exclude child from school or the child care facility for 7 days after the onset of the rash Immunization Routine practices
  • 20. Chickenpox is an infection caused by varicella-zoster virus.  Slight fever may be present before a rash develops.  Rash usually first appears on body, face, and scalp. It then spreads to limbs.  Rash begins as small, red, flat spots that develop into itchy fluid filled blisters.  After the blister breaks, open sores will crust over to form dry, brown scabs. • Usually lasts for about 10 days.
  • 21. • How is it spread? Airborne Direct contact A pregnant woman with chickenpox can pass it on to her baby during pregnancy. The virus does not live on objects like sheets, counters, or toys.
  • 22. • Incubation period: Usually 8 - 21 days from contact with an infected person • When is the person contagious? From 2 days before spots appear and until all blisters have crusted over (which is usually 5 days after the first blisters appear). Child is most infectious 12 - 24 hours before the rash appears. • How to prevent spread of the illness to other children. Routine practice isolation immunization
  • 23. Hand, foot, and mouth disease is caused by a coxsackie virus. It occurs mainly in the summer and early fall and is most common in children under 10 years of age. :  Fever  Sore throat  Headache  Small painful blisters inside the mouth on tongue and gums (last 4 to 6 days)  Blisters may appear on the palms of child’s hands, on their fingers, and on the soles of their feet for 7 to 10 days • It is possible to have the infection and not have any symptoms.
  • 24. • How is it spread? Airborne Touching infected child’s stool (e.g., assisting with toileting, changing a diaper) Touching objects (e.g., toys, tables, taps, door handles) contaminated with the virus • Incubation period: Usually 3 – 6 days from contact with an infected person • When is the person contagious? During the stage of acute illness, usually for about 7 – 10 days. The virus can be found in stool for 4 weeks after start of illness. • How to prevent spread of the illness to other children. No isolation Routine practices
  • 25. Impetigo is a common skin infection that is caused by group A streptococcal (strep) or staphylococcus aureus (staph) bacteria. Infection starts when strep or staph bacteria enter the body through a cut, insect bite, or scratch. It is most common in the summer.  Clusters of red bumps or blisters surrounded by area of redness  There may be fluid oozing out of the blisters and they may develop a yellow (honey colored) or grey crust Sores usually appear around the mouth and nose, and on skin not covered with clothes. • Impetigo often affects school age children who live in crowded conditions, play sports, or have other skin conditions.
  • 26. • How is it spread? Direct & indirect contact • Incubation period: Staph bacteria: 4 – 10 days from contact with an infected person Strep bacteria: 1 – 3 days from contact with an infected person • When is the person contagious? • As long as the rash continues to drain. After 24 hours of antibiotic treatment, a child with impetigo is no longer contagious. • How to prevent spread of the illness to other children. Exclude child from school or child care until 24 hours after starting antibiotic treatment. Routine practices
  • 27. Pertussis is a very contagious respiratory illness caused by the bacteria, Bordetella pertussis. It can cause serious illness in adults and children. Infants under one year of age are at highest risk.  Runny nose, low grade fever, and mild cough  After 1 – 2 weeks, the cough worsens  Child will cough violently and rapidly, over and over, until no air is left in their lungs. Child will then inhale with characteristic “whooping” sound  Child will sometimes vomit after coughing • Coughing will last for several weeks (will usually start to decrease after about 6 weeks)
  • 28. • How is it spread? Airborne & indirect contact • Incubation period: Usually 7 – 10 days • When is the person contagious? Usually from the time when first symptoms develop (1 – 2 weeks before severe coughing starts) until about 3 weeks after cough starts • A child who is started on antibiotics is not infectious after 5 days of antibiotic therapy. • How to prevent spread of the illness to other children. Isolation: Five days from commencing antibiotic treatment, or 21 days from onset of illness if no antibiotic treatment Antibiotics may be recommended for high risk, close contacts of a child with pertussis (i.e., infant under 1 year of age, pregnant woman in her third trimester) or when there is a high risk person in the household or child care facility. immunization Routine practices
  • 29. Hepatitis A is an infection of the liver caused by the Hepatitis A virus. It is usually mild and rarely causes permanent liver damage. Hepatitis A is usually more serious in adults than children.  Fever  Fatigue  Loss of appetite, nausea, and vomiting  Abdominal pain  Jaundice (yellowing of the skin and eyes) • Most infants and young children infected with hepatitis A have no symptoms
  • 30. • How is it spread? Hepatitis A virus is found in the stool of infected people. The virus is spread through:  Direct contact with the stool of an infected person  Direct contact with the hands of an infected person  Direct contact with an object contaminated with the virus  Eating food prepared by an infected person  Drinking contaminated water • Incubation period: Usually 25 – 30 days (range is 15 – 50 days) • When is the person contagious? From about 14 days before onset of symptoms until about 7 days after onset of jaundice. Infants and children may continue to shed virus in their stool for up to 6 months. • How to prevent spread of the illness to other children. Isolation 7 days from onset of jaundice Immunization or immune globulin Routine practices