|
Questions and Answers on Avian Influenza
(Adapted from the U.S. Centers for Disease Control
and Prevention and the World Health Organization websites)
Question: What is an avian influenza A (H5N1) virus_
Influenza A (H5N1) virus - also called "H5N1 virus" - is
an influenza A virus subtype that occurs mainly in birds. It was first
isolated from birds (terns) in South Africa in 1961. In 2003, a strain
of H5N1 emerged in Asia that was highly deadly among poultry. This
virus quickly spread to other bird species. While infection has been
concentrated in Southeast Asia, the H5N1 virus has the potential to
circulate among birds worldwide. For detailed information about avian
influenza, visit the U.S. Centers for Disease Control and Prevention
in Atlanta (CDC-Atlanta) website at
or the World Health Organization (WHO) website at or the Food and Agriculture Organization of the United
Nations (FAO) website at Question: What is a pandemic_
A pandemic may occur when three conditions have been met: a new
influenza virus subtype emerges; it infects humans causing serious
illness; and it spreads easily and sustainably among humans. The H5N1
virus meets the first two conditions. The risk that it will acquire
the ability to have efficient and sustained human-to-human
transmission is present as long as opportunities for human infections
occur. These opportunities will persist as long as the virus continues
to circulate in domestic birds, perhaps for years to come.
Question: What is the H5N1 bird flu that has recently been
reported in Asia_
Outbreaks of influenza H5N1 occurred among poultry in eight
countries in Asia (Cambodia, China, Indonesia, Japan, Laos, South
Korea, Thailand, and Vietnam) during late 2003 and early 2004. At that
time, more than 100 million birds in the affected countries either
died from the disease or were killed in order to try to control the
outbreak. By March 2004, the outbreak was reported to be under
control. Beginning in late June 2004, however, new deadly outbreaks of
influenza H5N1 among poultry were reported by several countries in
Asia (Cambodia, China, Indonesia, Malaysia, Thailand, and Vietnam). It
is believed that these outbreaks are ongoing. Human infections of
influenza A (H5N1) have been reported in Thailand, Vietnam, Cambodia,
and Indonesia.
Question: What is the risk to humans from the H5N1 virus in
Asia_
The H5N1 virus does not usually infect humans. In 1997, however,
the first case of infection from a bird to a human was identified
during an outbreak of bird flu in poultry in Hong Kong. The virus
caused severe respiratory illness in 18 people, 6 of whom died. Since
that time, there have been other cases of H5N1 infection among humans.
Most recently, human cases of H5N1 infection have occurred in
Thailand, Vietnam, Cambodia, and Indonesia. The Case Fatality Rate (CFR)
prior to March 2005 was around 70% but has since dropped to 50
percent. Almost all cases to date have occurred after direct contact
with infected poultry or contaminated surfaces. Less than 5 cases have
been attributed to person-to-person transmission. So far, spread of
H5N1 virus from person to person has been rare. However, because all
influenza viruses have the ability to change, scientists are concerned
that the H5N1 virus could become more adapted within humans and then
more easily spread from one person to another. Because these viruses
do not commonly infect humans, there is little or no immune protection
against them in the human population. If the H5N1 virus were able to
infect people and spread easily from person to person, an
"influenza pandemic" (worldwide outbreak of disease) could
begin. No one can predict when a pandemic might occur. However,
experts from around the world are watching the H5N1 situation in Asia
very closely and are preparing for the possibility that the virus may
begin to spread more easily and widely from person to person.
Question: What is the current situation in Indonesia regarding
Avian Influenza_ Is this an Epidemic_ Updated
December 9, 2005
There have been eight fatal cases of avian influenza (AI) in
Indonesia. The presence of AI in these eight cases was confirmed by
the Centers for Disease Control (CDC) in Atlanta and the
WHO-affiliated lab in Hong Kong. There are a number of other cases
currently under investigation. Although some of these fatalities
occured within one family there is no evidence that the AI virus has
acquired the ability to be transmitted human-to-human. There is no
evidence to suggest that there is an epidemic in Indonesia.
Question: How is infection with H5N1 virus in humans treated_
Currently no vaccine has been approved to provide protection
against the H5N1 strain currently in Asia, although a number of
candidates are in development. Anti-viral compounds such as amantadine,
rimantadine, zanamavir and oseltamavir (Tamiflu) have shown some
efficacy against other Influenza A viruses, and an initial study using
oseltamavir on mice suggests that it may be effective against H5N1.
However, some of the H5N1 virus subtypes in Southeast Asia possess a
mutation that would suggest that they are less sensitive to some
antiviral compounds.
Question: Should I begin taking antiviral medications such as
Tamiflu if I'm planning a visit to Indonesia_ Is Tamiflu available in
Indonesia_
Tamiflu (oseltamivir) is not available in Indonesia. Travelers
coming to Indonesia should consider scheduling an appointment with
their health care provider before leaving the U.S. to discuss risks
for potential exposure to H5N1. Risk of exposure and the decision to
take a drug like Tamiflu, which, as yet, has no proven role for
preventing human H5N1 infections must be determined on a case-by-case
basis. Only you and your health care provider can determine that risk
and what the most appropriate precautions are for you.
Question: Is there a vaccine to protect humans from H5N1 virus_
There currently is no vaccine to protect humans against the H5N1 virus
that is being seen in Asia. However, vaccine development efforts are
under way. Research studies to test a vaccine to protect humans
against H5N1 virus began in April 2005. (Researchers are also working
on a vaccine against H9N2, another bird flu virus subtype.) For more
information about the H5N1 vaccine development process, visit the
National Institutes of Health website.
Question: What are the symptoms of bird flu in humans_
Symptoms of bird flu in humans have ranged from typical flu-like
symptoms (fever, cough, sore throat and muscle aches) to eye
infections, pneumonia, severe respiratory diseases (such as acute
respiratory distress), and other severe and life-threatening
complications. The most consistent symptoms include fever (>38°C
or >100.4°F) and a respiratory syndrome including a non-productive
cough and sore throat.
Question: How are people infected_
Infected birds shed flu virus in their saliva, nasal secretions, and
feces. Susceptible birds become infected when they have contact with
contaminated excretions or surfaces that are contaminated with
excretions. It is believed that most cases of bird flu infection in
humans have resulted from contact with infected poultry or
contaminated surfaces. The main route of human infection is direct
contact with infected poultry or surfaces and objects contaminated
with their feces or blood. To date, most human cases have occurred in
rural and peri urban areas where households keep small poultry flocks
that roam freely, often entering homes and sharing children's outdoor
play areas. Large quantities of the virus are excreted in the feces of
infected poultry. In countries where poultry is relied upon for income
and food, families slaughter and consume birds that are ill. Exposure
occurs during slaughtering, defeathering, butchering and preparation
of poultry for cooking. Infection in humans occurs with consumption
ofinadequately cooked poultry or raw poultry products such as duck's
blood. There is no evidence that properly cooked poultry or eggs are a
source of infection.
Question: What is the risk to humans from bird flu_
The risk of H5N1 is considered quite low for most people. Care
should be taken, however, at times of outbreak among poultry
(domesticated chicken, ducks, turkeys, etc.). There is a possible risk
to people who have contact with infected birds or surfaces that have
been contaminated with excretions from infected birds. The current
outbreak of avian influenza A (H5N1) among poultry in Asia is an
example of a bird flu outbreak that has caused human infections and
deaths. In such situations, people should avoid contact with infected
birds or contaminated surfaces, and should be careful when handling
and cooking poultry.
Question: Is it safe to eat poultry and eggs in Indonesia_
There have been no reported human cases of AI contracted from poultry
or egg consumption. Nevertheless, best practices during handling of
raw poultry meat and usual recommended cooking practices for poultry
products should be followed to lower the risk of common bacterial
diseases spread by poor handling and cooking techniques. Eggs from
infected poultry could also be contaminated with the virus and
therefore care should be taken in handling shell eggs or raw egg
products.
Recommended good hygienic practices to avoid spreading of the virus
through food (adapted from the World Health Organization 5 Keys to
safer food):
- Separate raw meat from cooked or ready-to-eat foods to avoid
contamination:
Do not use the same chopping board or the same knife.
Do not handle both raw and cooked foods without washing your hands
in between and do not place cooked meat back on the same plate or
surface it was on before cooking.
- Do not use raw or soft-boiled eggs in food preparations that
will not be heat treated/cooked.
- Keep clean and wash your hands: after handling frozen or thawed
raw chicken or eggs, wash thoroughly with soap your hands,
surfaces and utensils that have been in contact with the raw
meat.
- Cook thoroughly: Thorough cooking of poultry meat will
inactivate the viruses. Either ensure that the poultry meat
reaches 70°C (160°F) or that the meat is not pink. [Note: USDA/FSIS
recommends 180 degrees Fahrenheit for whole turkey/chicken, thighs
or wings and 170 degrees Fahrenheit for chicken and turkey
breasts]. Egg yolks should not be runny or liquid.
For more information about avian influenza and food safety issues,
visit the World Health Organization (WHO) food safety website at
Question: Are other animals at risk for H5N1 infection_
Evidence of H5N1 virus has been found in a variety of domestic and
wild fowl, pigs, and domestic and wild cats.
Question: What precautions should I take if I live in an area
affected by bird flu_
The spread of bird flu in affected areas can normally be
prevented.
- People should avoid contact with chickens, ducks or other
poultry -and their waste - unless absolutely necessary.
- Children are at higher risk because they may play where poultry
are found. Teach your children the following basic
guidelines:
- Avoid contact with any birds, their feathers, feces and
other waste.
- Do not keep birds as pets.
- Wash hands with soap and water after any contact.
- Not to sleep near poultry.
- Do not transport live or dead chickens, ducks or other
poultry from one place to another even if you think your birds are
healthy.
- Handling of poultry in affected areas should be done within the
area without transporting them to other areas.
- Do not prepare poultry from affected areas as food for your
family or animals. The slaughter and preparation of such birds for
food is dangerous.
- If you unintentionally come into contact with poultry in an
affected area, such as touching the bird's body, touching its
feces or other animal dirt, or walking on soil contaminated with
poultry feces:
o wash your hands well with soap and water after each
contact;
o remove your shoes outside the house and clean them of all dirt;
and
o check your temperature for 7 days at least once daily. If you
develop a high temperature (>37.5°C or (>99.5°F), visit a
doctor or the nearest health care facility immediately.
For more information about living in affected areas and possible
contact with infected animals, visit the WHO website at
Question: What are the travel recommendations regarding the H5N1
bird flu outbreak in Asia_
The U.S. CDC-Atlanta currently advises that travelers to countries
in Asia with known outbreaks of influenza A (H5N1) avoid poultry
farms, contact with animals in live food markets, and any surfaces
that appear to be contaminated with feces from poultry or other
animals. For more information about travel recommendations to
Indonesia and Southeast Asia, visit the CDC-Atlanta website at
and at
Question: Will I be able to leave Indonesia in the event of a
pandemic_
It remains to be seen how difficult getting flights out of the country
will be in the event of a pandemic, and which countries will elect to
close borders. Since pandemics overwhelm the capacity of health care
systems, it may be more prudent to make contingency plans to stay in
place. We have learned from past pandemics that crowding will hasten
infection with added surges stressing localhealthcare capacity. For
this reason, measures to decrease social interaction may become
prudent such as school closures, curtailing public gatherings, and
resorting to alternative work arrangements such as telecommuting. As
infection rates heighten in communities, issues such as care for the
sick and adequate food and water may become more important.
Stockpiling of food and water is difficult to argue against, a
pandemic being only one of several reasons.
Question: How is the U.S. Government helping to address the
Avian Influenza problem_
At MOH's request, the U.S. Navy Medical Research Unit (NAMRU-2) and
the CDC-Atlanta are working with the WHO to investigate the human
outbreak. This entails field and laboratory analysis of samples drawn
from individuals suspected of being exposed to Avian Influenza.
At MOH's request, the CDC-Atlanta has cultured H5N1 virus samples
to determine their genetic make up. This information will be helpful
in understanding the risks to humans in Indonesia and the rest of the
world.
USAID/Indonesia is making funds available to the Government for an
AI public information campaign and strengthened surveillance.
In recognition of the regional nature of the AI threat and to
support the international response to the H5N1 virus, the U.S.
Congress appropriated in June 2005 $25 million dollars to help contain
and prevent its spread in the Asia region. A team of experts from CDC,
U.S. Department of Agriculture (USDA) and USAID recently concluded an
assessment visit to Indonesia.
The U.S. has proposed an "International Partnership on Avian
and Pandemic Influenza" (IPAPI) to address the emerging threat of
AI. We hope to bring together countries to improve worldwide readiness
by elevating the issue on national political and social agendas,
coordinating efforts among donor and affected nations, and mobilizing
and leveraging resources. We have invited Indonesia to participate in
a senior officials meeting in Washington in October to formulate a
Plan of Action.
References
* * *
|
|