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Seasonal (or common) flu
is a respiratory illness that can be transmitted
person to person. Most people have some immunity,
and a vaccine is available.
Avian (or bird) flu
is caused by influenza viruses that occur naturally
among wild birds. The H5N1 variant is deadly to
domestic fowl and can be transmitted from birds to
humans. There is no human immunity and no vaccine is
available.
Pandemic flu
is virulent human flu that causes a global outbreak,
or pandemic, of serious illness. Because there is
little natural immunity, the disease can spread
easily from person to person. Currently, there is no
pandemic flu. |
Flu
Terms Defined - Seasonal flu, avian
flu, and pandemic flu are not the same.
What is Avian Flu
and what is the County doing?
Avian influenza
is a disease found among poultry. Avian flu viruses can
infect chickens, turkeys, pheasants, quail, ducks, geese
and guinea fowl as well as a wide variety of other birds,
including migratory waterfowl. Each year, there is a
flu season for birds just as there is for humans and , as
with people, some forms of the flu are worse than others.
Avian flu is primarily spread by direct contact between healthy
birds and infected birds, and through indirect contact
with contaminated equipment and materials. The virus
is excreted through the feces of infected birds and
through secretions from the nose, mouth and eyes.
The Health Department has
been working for several years with the Office of
Emergency Services and a broad network of community
responders to upgrade countywide plans for any possible
public health crisis in Westchester County, including an
avian flu epidemic or a pandemic flu outbreak. Training
exercises, community partnerships and technological
advances in communications and disease tracking are the
key elements that have been developed to ensure that the
health of the public is protected no matter what public
health emergency the county may experience.
Transmission of Influenza between animals and people
Although it is unusual for people to get influenza virus
infections directly from animals, sporadic human
infections and outbreaks caused by certain avian influenza
viruses and pig influenza viruses have been reported.
The
World Health Organization (WHO) maintains
situation updates
and
cumulative reports of human cases of avian influenza
(H5N1) and shows more
than 100 confirmed human cases
since 1997. Because of
concerns about the potential for more widespread infection
in the human population, public health authorities closely
monitor outbreaks of human illness associated with avian
influenza.
To date, human infections with avian influenza
viruses detected since 1997 have not resulted in
sustained human-to-human transmission. However, because
influenza viruses have the potential to change and gain
the ability to spread easily between people, monitoring
for human infection and person-to-person transmission is
important.
Symptoms of Avian Flu
in Humans
The reported symptoms of
avian influenza in humans have ranged from typical
influenza-like symptoms (e.g., fever, cough, sore throat,
and muscle aches) to eye infections (conjunctivitis),
pneumonia, acute respiratory distress, pneumonia,
and other severe and life-threatening complications.
How is avian influenza detected in
humans?
A laboratory test is needed
to confirm avian influenza in humans.
How is avian influenza
in humans treated?
Studies done in laboratories suggest that the prescription
medicines approved for human influenza viruses should work
in treating avian influenza infection in humans.
However, influenza viruses can become resistant to these
drugs, so these medications may not always work.
Additional studies are needed to determine the
effectiveness of these medicines.
Is there a risk for
becoming infected with avian influenza by eating poultry?
There is no evidence that properly cooked poultry or
eggs can be a source of infection for avian influenza
viruses. For more information about avian influenza
and food safety issues, visit the
World Health Organization website
.
The U.S. government
carefully controls domestic and imported food products,
and in 2004 issued a ban on importation of poultry from
countries affected by avian influenza viruses, including
the H5N1 strain. This ban still is in place.
For more information,
see Embargo of Birds.
Does the current
seasonal influenza vaccine protect me from avian
influenza?
No. Influenza vaccine for the 2005-06 season
does not provide protection against avian influenza.
However, public health officials recommend annual flu
shots to prevent illness and death from the flu viruses
that are currently circulating.
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A colorized image
shows H5N1 avian flu strain viruses (gold) grown in
dog kidney cells (green).
Photograph by C. Goldsmith/U.S. Centers for
Disease Control
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