2. PRESENTATION OUTLINE
• Zika Virus
• Epidemiology
• Clinical Information
• Pregnancy Registry
• Prevention Strategies
• Mosquito Bite Prevention and Control
• Mosquito Biology
• Zika Response Activities
• Controlling Mosquitoes at Home
• Preventing Mosquito Bites
3. TIMELINE OF MAJOR ZIKA EVENTS
1947
2007
2013-14
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
1st case in
Puerto Rico
2015-16 outbreak in Americas:
1st case of local transmission in Brazil
1st case in VA
traveler confirmed
WHO declares
Public Health
Emergency of
International
Concern
1947: Zika 1st
isolated
2015 2016
2007: Yap
Outbreak
2013–14: Fr.
Polynesia
outbreak
4. ALL COUNTRIES AND TERRITORIES WITH ACTIVE
ZIKA VIRUS TRANSMISSION
(AS OF 07/14/2016)
4
http://www.cdc.gov/zika/geo/active-countries.html
5. TRANSMISSION OF ZIKA VIRUS
• Bite of an infected Aedes aegypti or Ae. albopictus mosquito
• Pregnant woman infected with Zika, can pass Zika virus to her
fetus during pregnancy or around time of birth
• Sexual transmission
• Strong possibility passed through blood transfusions
6. • The most common symptoms
of Zika are:
• Fever
• Rash
• Joint pain
• Conjunctivitis (red eyes)
• Timeframe from exposure to symptoms is
3-14 days
• No vaccine or medications to prevent or
treat
SYMPTOMS OF ZIKA VIRUS
Modified from CDC Zika 101 presentation
7. ZIKA VIRUS CLINICAL DISEASE COURSE AND
OUTCOMES: ADULTS AND CHILDREN
• Clinical illness usually mild
• Most people infected do not show any signs of illness
• When symptoms do occur, last several days to a week
• Severe disease requiring hospitalization is rare
• Death is rare
• Guillain-Barré syndrome reported in patients following suspected Zika
virus infection
• Once a person has been infected, he or she is likely to be protected
from future infections
8. GUILLAIN-BARRÉ SYNDROME (GBS) AND ZIKA
• GBS is rare disorder where person’s own immune
system damages nerve cells, causing muscle weakness
and sometimes paralysis
• Symptoms can last a few weeks or several months
• Most people fully recover, but some have permanent
damage and, in rare cases, have died
• GBS is very likely triggered by Zika in a small
proportion of infections, much as it is after a variety of
other infections.
• CDC investigating the link between Zika and GBS
9. HOW DOES ZIKA AFFECT PREGNANT WOMEN?
• Zika virus is a cause of microcephaly and other
severe fetal brain defects.
• Defined by having a smaller than normal head or
brain circumference
• Prognosis varies depending on severity of
microcephaly
• Brazil reporting increase in number of babies with
microcephaly and some have had lab-confirmed
Zika
Rasmussen SA, Jamieson DJ, Honein MA, Petersen LR. Zika Virus and Birth Defects–Reviewing the Evidence for Causality. New EnglJ Med. 2016 Apr 13.
10. U.S. ZIKA PREGNANCY REGISTRY
• Purpose of registry:
• To monitor pregnancy and infant outcomes following Zika virus infection
• Who is included:
• Pregnant women with lab evidence of Zika virus infection
• exposed infants born to these women;
• Infants with laboratory evidence of congenital Zika virus infection and their
mothers.
11. ZIKA PREVENTION STRATEGIES:
TRAVELERS TO ZIKA-AFFECTED AREA
Pregnant or considering becoming
pregnant?
• CDC recommends women who are pregnant should not
travel to any area where Zika virus is spreading.
• If your male partner travels to these areas, either use
condoms correctly from start to finish, every time you
have vaginal, anal, and oral (mouth-to-penis) sex, OR do
not have sex during the pregnancy.
13. ZIKA PREVENTION STRATEGIES:
TRAVELERS TO ZIKA-AFFECTED AREA
For all other travelers:
• Pack to prevent (insect repellent, long-sleeved shirts, long pants, bed net, condoms)
• Avoid mosquito bites
• Sleep indoors in rooms with screened windows or air-conditioning, or use bed net if sleeping in
rooms exposed to outdoors
• Even if you do not feel sick, travelers returning to the United States from an area with Zika should
take steps to prevent mosquito bites for 3 weeks so they do not spread Zika to local mosquitoes
that could spread the virus to other people.
• Visit CDC’s Travelers Health website to see if the country you plan to visit has any travel health
notices (http://wwwnc.cdc.gov/travel/page/zika-travel-information)
14. SURVEILLANCE IN FAIRFAX COUNTY
• There has been no local transmission of Zika in Fairfax County or in the continental
USA
• Communicable Disease/Epidemiology Unit conducting human surveillance
• Disease Carrying Insects Program conducting mosquito surveillance
• If either of these indicate an area at high risk for Zika transmission—Health
Department will conduct educational outreach and begin mosquito control activities,
which may include:
• Removal of mosquito breeding sites
• Conducting pesticide treatments
16. CONTROLLING ZIKA IS EVERYONE’S JOB.
• Prevent mosquito
bites
• Eliminate container
habitats around
your yard and
common areas
Fairfax wants
you…
to help fight
Zika
A healthier community starts with you.
17. MOSQUITO LIFE CYCLE
7 to 10 days during
summer months.
1. Egg
2. Larva
3. Pupa
4. Adult
• Males: Nectar only
• Females: Nectar and
blood
18. MOSQUITOES THAT SPREAD ZIKA: AEDES
Yellow fever mosquito
(Aedes aegypti)
Asian tiger mosquito
(Aedes albopictus)
Dengue
Zika
Chikungunya
Yellow Fever
CDC
CDC
Rare in Virginia Common in Virginia
The Asian Tiger mosquito has the greatest potential to spread Zika
virus in Fairfax County.
19. ASIAN TIGER MOSQUITO BIOLOGY
• Lay eggs and develop only in
containers
• Feed on humans and other
animals
• Short flight range
• Less than150 meters
• Urban/sub-urban
• Active during daytime
• Peak @ dawn and dusk
• Rest in vegetation
CDC
CDC
20. ZIKA PREPARATION IN FAIRFAX COUNTY
• Education
• Outreach materials
• Community-based activities
• PSAs
• Yard inspections
• Mosquito Surveillance
• Collect adult mosquitoes and test for
Zika virus
• Larval collections
21. ASIAN TIGER MOSQUITO CONTROL
• Source reduction (Tip and Toss)
• Eliminate larval habitats, especially
containers
• Larvicides
• Control larvae when standing water
cannot be emptied
• Adulticides
• Barrier treatments to control adult
mosquitoes
22. VECTOR CONTROL FOR ZIKA VIRUS
TRAVEL-ASSOCIATED CASE
• Infected during travel to Zika-affected area and returned to Fairfax County
• Conduct site visit to case property and perform the following, as necessary:
• Educate
• Source reduction
• Larvicide
• Collect mosquitoes
• Adult mosquito control
23. VECTOR CONTROL FOR ZIKA VIRUS
LOCAL TRANSMISSION BY MOSQUITOES
Patient is symptomatic and lab-positive for Zika without recent travel history
to Zika-affected area
OR
Adult mosquitoes collected during surveillance test positive for Zika virus
THEN
Perform outreach, source reduction, larviciding, and adult mosquito control at
case property as previously described, and on additional properties in the
surrounding area
25. DO YOUR PART FROM THE START!
• Neighborhood cleanups: reduce
container habitats
• Everyone’s yard
• Common areas
• Streams where trash
accumulates
• Share what you know
26. ELIMINATE STANDING WATER
• Check yard weekly
• Tip, Pour, and Toss
• Throw away containers
• Store containers so they don’t
hold water
• Use larvicide if can’t empty
water
27. TIP AND TOSS STANDING WATER.
ELIMINATE CONTAINERS.
28.
29. Flood water
Ditches
Root-ball poolsWoodland poolsSalt marshes
Permanent swamps Polluted water Grass tussocks
Pooling streamsPonds with vegetation
Swimming pools
Stormwater management
structures
THESE HABITATS DO NOT PRODUCE
ASIAN TIGER MOSQUITOES
30. TREAT YOUR YARD WITH INSECTICIDE
• Follow label instructions
• Make sure product states that it controls
mosquitoes
• Use products that work for few weeks
after application (“residual”)
• Focus treatment on areas of dense
vegetation
31. DRESS TO PROTECT: COVER UP
• Long-sleeved shirt
• Long pants
• Socks and shoes
• Light colors
• Loose fit
• Permethrin-treated
clothing
32. USE AN EPA-REGISTERED REPELLENT
• Follow label instructions
• Active Ingredients:
• DEET, Picaridin, IR3535, or Oil
of Lemon Eucalyptus
• Reapply insect repellent as
directed
• Apply sunscreen before repellent
CDC
33. MOSQUITO BITE PREVENTION FOR CHILDREN
• Repellents
• Follow label instructions
• DEET: Children older than 2 months
• Oil of Lemon Eucalyptus: Children older
than 3 years
• Adults: Apply to hands and then apply to a
child’s face
• Avoid hands, eyes, mouth, and cut or
irritated skin
• Cover crib, stroller, baby carrier
34. USE PERMETHRIN ON CLOTHING
• Follow label instructions
• Permethrin is the active ingredient
• Apply to clothing, NEVER to skin
• Pre-treated clothing or DIY
35. AVOID MOSQUITO BITES
• Peak biting times: dawn and dusk
• Asian tiger mosquitoes bite all day
• Use air conditioning
• Repair doors and window screens
• Mosquitoes that spread Zika sometimes
enter homes
36. UPDATED INFORMATION ABOUT ZIKA
• Pan American Health Organization (PAHO): www.paho.org/zika
• Centers for Disease Control and Prevention (CDC):
www.cdc.gov/zika
• Virginia Department of Health (VDH):
http://www.vdh.virginia.gov/epidemiology/zika-virus-update/
• Fairfax County Health Department (FCHD)
http://www.fairfaxcounty.gov/hd/westnile/zika-virus.htm
Notes de l'éditeur
Zika virus was first discovered in 1947 in a monkey in the Zika Forest of Uganda. In 1952, the first human cases of Zika were detected and since then, outbreaks of Zika have been reported in tropical Africa, Southeast Asia, and the Pacific Islands. Zika outbreaks have probably occurred in many locations. Before 2007, at least 14 cases of Zika had been documented, although other cases were likely to have occurred and were not reported. Because the symptoms of Zika are similar to those of many other diseases, such as Dengue and Chikungunya, many cases may not have been recognized.
In May 2015, the Pan American Health Organization (PAHO) issued an alert regarding the first confirmed Zika virus infection in Brazil. On February 1, 2016, the World Health Organization (WHO) declared Zika virus a Public Health Emergency of International Concern (PHEIC). Local transmission has been reported in many other countries and territories. Zika virus will likely continue to spread to new areas.
Multiple things could highlight, including any of the following:
1947: Zika first isolated from a monkey in Uganda (Zika forest)
Before 2007: only sporadic human cases reported from Africa and Southeast Asia
2007: 1st outbreak reported on Yap Island (Federated States of Micronesia)
2013-2014: Outbreak in French Polynesia (>28,000 suspected cases)
May 2015: Pan American Health Organization issued an alert regarding 1st confirmed Zika case in Brazil
May 2015-current: local transmission reported in several other countries and territories
Dec 2015: Puerto Rico reported 1st
Jan 22, 2016: CDC actives Emergency Operations Center (EOC)
Jan 26, 2016: 1st imported case in Virginia identified (onset was 12/2/15)
Feb 1, 2016: WHO declares Zika a public health emergency of international concern
49 countries/territories currently reporting active zika virus transmission
Most people infected with Zika virus won’t even know they have the disease because they won’t have symptoms. The most common symptoms of Zika are fever, rash, joint pain, or conjunctivitis (red eyes). Other common symptoms include muscle pain and headache. The incubation period (the time from exposure to symptoms) for Zika virus disease is not known, but is likely to be a few days to a week.
The illness is usually mild with symptoms lasting for several days to a week.
People usually don’t get sick enough to go to the hospital, and they very rarely die of Zika. For this reason, many people might not realize they have been infected.
Zika virus usually remains in the blood of an infected person for about a week but it can be found longer in some people.
Once a person has been infected, he or she is likely to be protected from future infections.
Source: http://www.cdc.gov/ncbddd/birthdefects/microcephaly.html
Microcephaly is a birth defect where a baby’s head is smaller than expected when compared to babies of the same sex and age. Babies with microcephaly often have smaller brains that might not have developed properly.
Babies with microcephaly can have a range of other problems, depending on how severe their microcephaly is. It was been linked with seizures, developmental delay, intellectual disability, problems with movement and balance, feeding problems, hearing loss and vision problems.
Difficult birth defect to monitor because of inconsistent definition and use of terminology
Adverse Outcomes and Zika Virus
A range of other problems have been reported:Eye abnormalities
Hearing impairment
Seizures
Swallowing impairment
Hypertonicity and posturing
Contractures, including club foot and curving of the joints
Severe irritability
Developmental delay
Growth abnormalities, including intrauterine growth restriction and disproportionate growth (head size alone affected)
Karwowski MP, Nelson JM, Staples JE, et al. Zika Virus Disease: A CDC Update for Pediatric Health Care Providers. Pediatrics.2016;137(5):e20160621
http://www.bt.cdc.gov/coca/ppt/2016/04_12_16_zikaclinicalguidelines_fb.pdf
More information is available on the U.S. Zika Pregnancy Registry website at www.cdc.gov/zika/hc-providers/registry.html
To contact CDC Registry staff, call the CDC Emergency Operations Center watch desk at 770-488-7100 and ask for the Zika Pregnancy Hotline or email ZIKApregnancy@cdc.gov
-Interrupt the cycle
-eggs singly laid versus rafts
-talk about complete metamorphosis
-talk about egg laying and drying needed for development
-talk about getting indoors
Engaging stakeholders (April, May)
Zika 101 for county employees
Website with updated outreach materials
Zika action plan calls for increasing mosquito control in response to local cases of Zika
Adult mosquito control, in the form of barrier sprays, will be considered as part of an integrated approach that uses other methods, such as source reduction.
-Conduct site visit to case property
-During the epidemiological investigation, the patient will already have received advice about avoiding mosquito bites.
-When vector control specialists investigate the property, we will also give the residents hard copies of educational materials, and request that they stay indoors during our inspection to avoid mosquito bites.
-Tip and toss all standing water, eliminate larval sources
-Standing water than cannot be eliminated treated with larvicide
-Set BG-sentinel mosquito trap to determine adult Asian Tiger mosquito abundance. This trap specifically targets Asian Tiger mosquitoes. Make observations about adult mosquito activity on property.
-If warranted based on thresholds (# of mosquitoes found), barrier application may be used on case property
-Asian tiger mosquitoes typically do not fly more than a few hundred feet from their larval source when looking for hosts. If we can eliminate any potential container habitats that would harbor larvae, and kill many of the adult mosquitoes case property and additional nearby properties, we can reduce the risk of expansion of the virus outward from the case property.
Mosquitoes prefer to rest in shaded, high-humidity places
Thick bushes, ivy, azaleas, boxwoods, etc.