Bird flu found in dog
Questions raised about infection through eating
http://www.dailyheraldtribune.com/z_Sc_birdflu1013.lasso
By The Canadian Press
Thai scientists have reported a case of H5N1 influenza infection in a dog, a finding that lengthens the unusually long list of mammals this avian flu virus can infect.
The report, which suggests the dog became infected by eating ducks killed by the virus, also underscores a need to determine whether the virus can be transmitted through consumption of infected animals or their meat, a World Health Organization (WHO) scientist said Wednesday.
''This is the third species or fourth species that has been infected by eating carcasses.
So I think we really have to think about the risk of oral ingestion,'' said Michael Perdue, an avian flu expert with the WHO's global influenza program. ''I mean, these guys are getting infected somehow and we don't know how.''
Since H5N1 flared up in Asia in late 2003, tigers, leopards, domestic cats and now dogs have become infected with the virus by eating infected chicken or duck carcasses.
Other mammals - a stone marten, and a small number of pigs - have also been shown to be susceptible to infection, though in those cases the mode of transmission isn't yet documented.
There have also been some human cases where it's thought ingestion of virus was the mode of infection - most notably a trio of brothers in Vietnam who fell ill after eating uncooked soup made from duck's blood.
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Influenza infection occurs in the respiratory tract, when the mucous membranes of the nose and throat come in contact with viruses propelled through the air by sneezes and coughs. A person can also become infected by touching items onto which viruses have been sneezed and then touch their nose or mouth.
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It's not thought that infection can occur in the human gastrointestinal tract. And the WHO's official position is that there is no evidence people can become infected by eating properly cooked poultry or eggs.
When tigers and leopards in Thai zoos died after being fed infected chickens in late 2003 and again in 2004, scientists speculated infection occurred when the animals ripped apart the carcasses.They believe the cats breathed in viruses that had been lodged in the birds' feathers.
Perdue said that may indeed be the way these infections have occurred. But he questions whether something else might be at play - and thinks the scientific community ought to nail down the answer.
''Is there tissue that's infectible before it (the infected meat) gets to the stomach? That's the other option. Esophogeal tissue or mucosal tissue (in the gastric tract) that allows the virus to infect?'' he wondered in an interview from Geneva.
The case of the dog, reported in the November issue of the journal Emerging Infectious Diseases, actually occurred in October 2004.
Scientists and people who follow H5N1 developments on Internet blogs and websites were aware of it, but this article by scientists from Thailand's Kasetsart and Chulalongkorn universities is the first scientific publication showing canine infection with the virus.
they also found infection in cat's intestine, and theoretically
the virus can survive stomach acid for some time.
There was a good report about the safety of eating infected chickens :
http://www.efsa.europa.eu/etc/medialib/efsa/science/biohaz/biohaz_documents/1412.Par.0001.File.dat/biohaz_report_ej74_avian_influenza_en2.pdf
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