April
23, 2003
Wyoming Department of Health Begins West Nile Virus Surveillance
for2003 with Expectations of Higher Numbers of Bird, Horse, and
Human Cases; Announces Web site and Media Campaign to Educate Public.
CHEYENNE - Department of Health officials today announced
the commencement of surveillance activities for West Nile virus
(WNV) for2003 and highlighted preventive measures in eliminating
the risks of being bitten by mosquitoes. They also unveiled a new
web site with information on WNV and a toll-free number for anyone
with questions on the disease - particularly questions on dead bird
submissions.
The web site is: www.badskeeter.org
The phone number is: 1-877-WYO-BITE
West Nile virus is historically found in portions
of Africa, the Middle East, and Central Europe. In 1999, WNV invaded
New York City and has since spread to all but four states in the
continental United States. Nationwide last year 4,161 people became
ill and 284 people died from WNV infection. However, less than 1
percent of the people infected with WNV become seriously ill. About
one-third of the people infected develop flu-like symptoms and the
majority of people never get sick. Two non-fatal human cases were
reported in Wyoming last year but the number of human infections
will likely increase as the virus continues to expand throughout
the state, said Terry Creek more, the West Nile virus surveillance
coordinator for the Wyoming Department of Health .
The state will begin testing of dead birds (crows,
magpies, jays, and ravens only) beginning May 1 and running through
October. Upon calling the 1-877-WYO-BITE number, if people are asked
to send a dead bird they will be advised on how the carcass(es)
will be transported to the laboratory for testing. Creek more reminded
people to handle the carcass with gloves or put a plastic bag over
hands, then double-bag the bird and add an ice pack if available
and place the bagged bird in a cool place but not in their refrigerator
or freezer.
WNV is transmitted primarily through the bite of an
infected mosquito -persons cannot become infected through contact
with an infected bird,horse, or human, he said, but it is unwise
to handle any dead animal with bare hands.
Not every bird that is submitted will be tested. Reasons
include birdis too decomposed, excessive birds have already been
submitted from the area, bird is wrong species, etc. Results are
usually available within 3to 4 weeks. Persons will be notified ONLY
IF the bird is positive.
Last year, the state public health lab tested 90 human
cases with two positives and the state veterinary lab tested 342
horses with 96positives and 273 birds with 20 positives.
The "Bad Skeeter: Prevent West Nile Virus" education
campaign this year is pretty ambitious, said Ross Doman, public
information officer for the department of health. Doman said brochures
and pamphlets will be available soon along with a radio campaign
and the agency is planning other creative message outlets such as
banners for rodeo arenas, wallet cards, bookmarks for school children
and even placing messages on the big screen in movie theaters before
the show. He said the department of health is teaming with other
state agencies and the University of Wyoming to help spread the
message.
| WEST
NILE VIRUS FACT SHEET |
|
What is West Nile Virus?
West Nile virus (WNV) is a mosquito-borne disease that can
cause encephalitis or brain infection. Mosquitoes spread this
virus after they feed on infected birds and then bite people,
other birds and animals.
WNV is not spread by person-to-person contact and there is
no evidence that people can get the virus by handling infected
animals. Surveillance for West Nile virus was initiated in
Wyoming in 2001 and currently involves the reporting and testing
of dead birds, and the testing of sick horses.
Suspected human cases are also tested in the Wyoming Department
of Health's public health lab. People with mild infections
may experience fever, headache, body aches, skin rash and
swollen lymph glands. This is called West Nile fever. People
with more severe infections may experience high fever, headache,
neck stiffness,stupor, disorientation, coma, tremors, convulsions,
and paralysis. This is called West Nile encephalitis. If you
have any of these symptoms,contact your health care provider.
Please see your primary care physician for more details.
About Encephalitis
West Nile virus human cases in Wyoming occur primarily in
the late summer or early Fall, although the mosquito season
is April through October. The majority of people who get infected
with the virus have no illness, or at most, have an infection
similar to a mild flu with fever,headache and fatigue. Rarely
will the virus multiply in the central nervous system and
cause the brain disease called encephalitis.
It can occur however. In fact, two-thirds of
people who develop encephalitis or meningitis have serious
long-term health problems handsome people never fully recover.
Wyoming has three kinds of arboviral encephalitis:
West Nile encephalitis, Saint Louis encephalitis, and Western
Equine encephalitis.An arboviral Encephalitis is an infectious
disease that affects the brain. The disease is caused by a
virus which attacks and destroys some nerve cells and causes
brain inflammation and swelling.
Encephalitis arboviruses belong to several
families of viruses that usually infect birds and are transmitted
from bird to bird by mosquitoes. The name"ar-bo-virus" comes
from the fact that they are transmitted by arthopods(insects
and other bugs).
What is West Nile encephalitis?
West Nile encephalitis is caused by West Nile virus, a flavivirus
previously only found in Africa, Eastern Europe, and West
Asia. West Nile virus is closely related to St. Louis encephalitis
virus (SLEV) which is found in the United States and to the
Japanese Encephalitis virus from South East Asia and to Murray
Valley fever virus from Australia and New Guinea.
How can I get it?
The principle route of human infection is through the bite
of an infected mosquito. In 2002, additional routes became
apparent; however, this represented avery small proportion
of cases. These routes include receiving transplanted organs
and blood transfusions, trans placental and possibly breastfeeding
transmission, and laboratory workers working with West Nile
infected products.
Who is most at risk?
Anyone can get the virus; however, people over 50 years of
age have the highest risk of developing a severe illness because
as we age, our bodies have a harder time fighting off disease.
People with compromised immune systems are also at increased
risk.
What are the symptoms?
People with mild infections may experience fever, headache,
body aches,skin rash and swollen lymph glands. This is called
West Nile fever. People with more severe infections may experience
high fever, headache,neck stiffness, stupor, disorientation,
coma, tremors, convulsions,e is teaming with other state agency
and paralysis. This is called West Nile encephalitis. If you
have any of these symptoms, contact your healthcare provider.
Are there long-term consequences?
While most infections are usually mild, West Nile Encephalitis
can result in death or serious brain damage. The CDC notes
that neurological effects may be permanent. Some improvements
may be seen over time.Is there treatment or a vaccine?There
is no specific treatment for West Nile virus infection, nor
a vaccine. While most people fully recover from the viral
infection, in some severe cases hospitalization may be needed.
|
How to Protect Yourself
Although mosquitoes are most active at dusk or dawn, some bite during
the day. All mosquitoes will bite if you enter an area where they
are resting, such as high grass or heavy underbrush. While it is
not necessary to limit outdoor activity (unless there is evidence
of mosquito-borne disease in the area), you can and should reduce
your risk of being bitten by mosquitoes.
Common sense steps you can take to minimize the probability
of infection include remembering the 5 D's
of West Nile Virus:
DAWN AND DUSK - When
possible, avoid spending time outside at dawn and dusk.
DRESS- Wear shoes, socks,
long pants and a long-sleeved shirt when outdoors for long periods
of time or when mosquitoes are most active. Clothing should be light
colored and made of tightly woven materials to keep mosquitoes away
from the skin.
DRAIN - Reduce the amount
of standing water in or near your property by draining and/or removing
it. Mosquitoes may lay eggs in areas withstanding water. See below
for more information and tips on reducing the amount of standing
water in or near your property.
You can also protect your family from biting mosquitoes
by reducing the amount of standing water available for mosquito
breeding in or near your property. To reduce standing water, consider
the following:
- Repair failed septic systems.
- Check and repair screens on windows and doors
- Dispose of tin cans, plastic containers, ceramic
pots or similar water-holding containers.
- If possible, remove old or discarded tires on your
property. Used tires have become the most common mosquito breading
site in the country.If you cannot dispose of old tires, you can
drill holes in them to allow standing water to drain.
- For containers that must remain on your property,
such as bird bath sand wading pools, change the water at least once
per week.
- Cover trash containers to keep out rainwater.
- Repair leaky water pipes and outside faucets.- Aerate
ornamental pools or stock them with predatory fish.
- Clean and chlorinate swimming pools even if they
are not being used.
- Keep drains, ditches, and culverts free of grass
clippings, weeds and trash so water will drain properly.
- Remove all leaf debris.
- Drill holes in the bottoms of all recycling containers
that are kept outdoors.
- Make sure roof gutters drain properly. Clean clogged
gutters in the spring and fall to remove leaves or other debris
that may clog the drains or gutters.
- Turn over plastic wading pools and wheelbarrows
when not in use.- Clean vegetation and debris from the edge of ponds.
- Drain water from pool covers.
- Use landscaping to eliminate standing water that
collects on your property. There are other things that you can do
to protect your family from West Nile virus. Consider doing the
following:
- Install or repair screens for windows and doors
that stay open, so that mosquitoes cannot get indoors.
- Place mosquito netting over infant carriers when
you are outdoors with infants.
If you know of specific mosquito control problems
or problem areas, call your local city or county public works director,
City Hall, or the Board of Supervisors.
- For additional protection from mosquitoes, use an
insect repellent containing DEET (N,N-diethyl-m-toluamide). Spray
clothing with repellents containing permethrin or DEET because mosquitoes
may bite through thin clothing.
Products containing DEET must be used properly.See the section on
When Using DEET [insert link here to section]. When Using DEET,
be sure to Read and follow instructions on the label to avoid excessive
use and over-application. In most circumstances products with 25
to 35 percent DEET provide adequate protection for adults.
- Apply DEET repellent to clothes whenever possible.
Spray clothing with repellents containing permethrin or DEET since
mosquitoes may bite through thin clothing. Apply sparingly to exposed
skin, and only then if the label permits.
- Do NOT apply repellents containing permethrin directly
to exposed skin. If you spray your clothing, there is no need to
spray repellent containing DEET on the skin under your clothing.
- Use just enough repellent to cover exposed skin
and/or clothing.
- Do not spray DEET directly on the face. Instead,
spray repellent onto the hands and use them to apply it to the face.
Remember to avoid sensitive areas like the eyes, mouth and nasal
membranes.
- Do not apply over cuts, wounds, irritated skin,
or under clothing.
- To find out if you have a reaction to DEET, apply
the repellent to a small area of an arm or leg before general use.
- Avoid spraying repellents on plastic (such as watch
crystals and eyeglasses), synthetic fabrics, leather, or painted
or varnished surfaces. Spraying DEET on these things may cause damage.
- Do not spray DEET repellents in enclosed areas
as the spray mist is not meant to be inhaled.
- Upon returning indoors, wash any treated skin with
soap and water.
- Wash any DEET treated clothing before wearing them
again. DEET products usually repel mosquitoes for several hours.
However, repellents are effective only at short distances from the
treated surface, so you may still see mosquitoes nearby. As long
as you are not being bitten,there is no need to apply more repellant.
Apply insect repellent sparingly to exposed skin.
The more DEET a repellent contains the longer time
it can protect you from mosquito bites. A higher percentage of DEET
in a repellent does not mean that your protection is better - just
that it will last longer. DEET concentrations higher than 50% do
not increase the length of protection. Choose a repellent that provides
protection for the amount of time that you will be outdoors. Products
with 10 to 35 percent DEET will provide adequate protection under
most conditions.When using DEET with children, consider
the following:
- Use lower concentrations.
- Do NOT allow children to apply DEET repellent themselves.
- Do NOT use DEET on infants.
- Current CDC Guidelines suggest that if a repellent
containing DEET is used on children under 2 years of age, only one
application per day should be used.
Why do we Monitor Dead Birds?
Birds and horses typically become infected with West Nile virus
(WNV)before humans, so dead birds and sick and dead horses are an
indicator of WNV activity. We use animal surveillance to map the
distribution and prevalence of WNV so that health and mosquito control
officials are aware of it's presence and can take whatever measures
are available to mitigate the impact of WNV on human and equine
populations.
The idea is to identify the virus before humans are
affected so that public education and mosquito control can reduce
the impact.
Dead Bird Reporting
Report only dead crows, ravens, jays, and magpies.If you find a
dead bird on your property, DO NOT SEND it to state or local health
agencies. Call the West Nile toll-free number at
1-877-WYO-BITE for instructions.
You will be asked to provide the following information:
name, phe is teaming with other state agenconenumber, bird species,
number dead, address where bird found, and approximate date of death.If
the bird(s) are suitable for testing you will be advised on how
to handle and submit the carcasses.
If Asked to Send a Dead Bird, handle dead bird with
gloves or put a plastic bag over your hand to pick up the carcass.
Then double-bag the bird and add an ice pack if available. Place
the bagged bird in a cool place but not in your refrigerator or
freezer.
WNV is transmitted primarily through the bite of an
infected mosquito. Persons cannot become infected through contact
with an infected bird,horse, or human. You will be advised by the
person you speak with at the toll-free number on how the carcass(es)
will be transported to the laboratory for testing. Not every bird
that is submitted will be tested.
Reasons include bird is too decomposed, excessive
birds have already been submitted from the area, bird is wrong species,
etc.
Results
Results are usually available within 3 to 4 weeks. Persons will
be notified ONLY IF the bird is positive. The Wyoming Department
of Health will continue to test jays, magpies,crows, and ravens
from the state between May 1 and Oct. 30, 2003.
For more information,
contact:
Terry Creekmore, Wyoming Department of Health West Nile Virus Surveillance
Coordinator, (307) 742-6681, ext. 105
Ross Doman, Wyoming Department of Health Public Information
Officer, (307) 777-6420
|