Bird Flu, your Cat, and You

Highly Pathogenic Avian Influenza, caused by the H5N1 virus,(commonly called bird flu)has been detected in cats and other felidae (e.g. leopards and tigers) from time to time since the start of the present poultryavian influenza epidemic in 2003.

In 2004 researchers showed that cats can be infected with H5N1 virus and that the virus could not only cause severe disease (and death) in cats, but also that cats could transmit the virusto other cats.

On present evidence however, it is highly unlikely that cats play any major role in the naturaltransmission of H5N1 viruses. In other words, although susceptible to the virus, theyare "accidental" hosts.

However, because cats can be susceptible to the H5N1 virus, it does mean that there is the potential for domestic cats to contract the disease and then to pass it on to othercats, other species, and perhaps humans.

How might cats become infected with the H5N1 virus? There are 2 main scenarios.

a) Eat infected poultry meat - hence the association between infected cats and outbreaks ofbird flu in poultry.

b)Many migratory waterfowl are carriers of the H5N1 virus. These are unlikely to comeinto close contact with cats, but they intermingle with other bird types that might wellcome into close contact with cats.

Cats are not the only mammals that can be infected with the H5N1 influenza virus. Tigers,Leopards, Civets, dogs and pigs are all recorded as having been infected and there is littlereason to suggest that other mammals could not be infected by the virus.

While this information is slightly unsettling, it needs to be put in context. Mammals (includinghumans) need to be exposed to massive amounts of virus to become infected. This is supported bythe fact that most human deaths from H5N1 have occurred where those people have had prolonged exposure to poultry circulating the H5N1 virus.

In addition, infected mammals shed very small amounts of virus, thus further reducing the potential for transmittingthe virus from mammal to mammal (e.g. from cat to human).

A few other things worth mentioning.

1) The H5N1 virus is quickly killed at 70C. Thus normal cooking of chicken meat willkill the virus.

2) Commercial poultry routinely slaughtered at an approved slaughter plant does notrepresent a health hazard. This means that 99.9% of dressed poultry available in all first world economies (and many developing economies) is perfectly safe to eat. Not eatingchicken "because of bird flu" is a nonsensical, uninformed reaction.

3) Not every cat that develops the sniffles now has bird flu! However, if you are in anarea that has had an H5N1 outbreak in poultry, then a sick cat should ring some alarm bells.

4) Practice normal good hygiene - wash your hands with soap and water after handling animalsor cleaning out litter trays etc.

So while cats can become infected with the bird flu virus, the chances of them transmitting it to other animals or humans at the moment is very slim indeed. Unfortunately, Influenza viruses are constantly changing through mechanisms known as antigenic shift and antigenic drift, which means thatwhat is true today may change in six months time.

Watch this space!

Keith Perrett is a qualified Veterinarian
http://www.pet-health-for-humans.com/bird-flu.html

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