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WHO: Urges More study of Cats with BF
Posted: March 07 2006 at 6:06am
WHO urges more studies on bird flu infections in cats
Tue Mar 7, 2006 1:41 PM GMT
GENEVA (Reuters) - Reports that a cat contracted bird flu and has not
fallen ill could mean the virus is adapting to mammals and poses a
potentially higher risk to humans, a World Health Organisation (WHO)
official said on Tuesday.
Michael Perdue, a scientist with the WHO's global influenza programme,
said more studies were needed on infections in cats, including how they
shed the virus.
But Perdue said there was no current evidence that cats were hidden
carriers of a virus which can wipe out poultry flocks in the space of 48
hours and occasionally infects people.
Austria said on Monday that a cat in an animal sanctuary in the southern
city of Graz had tested positive for the H5N1 bird flu virus but had yet to
show any symptoms of the disease.
However, the virus can take up to a week to strike and perhaps the cat in
Austria could still develop clinical signs, according to Perdue.
"We have to follow-up with laboratory studies to see if it (the virus)
changed genetically and is not causing clinical signs," Perdue told
"If it is true, it would imply the virus has changed significantly," he said.
The virus has killed 95 people in East Asia and the Middle East since late
2003. Most of the victims contracted the disease directly from sick
poultry, but experts fear the virus could mutate and spread easily among
people, sparking a pandemic which could kill millions.
Animals carrying H5N1 without showing any signs of ill health could
make it harder to detect and contain bird flu. The longer the virus
remains dormant in a mammal, without it getting sick or dying, the
greater the risk of it also mutating into a more dangerous form.
"The longer it stays in mammals one would assume it is more likely to be
adapted to mammals, as opposed to staying in birds. If the virus obtains
all the mutations needed to transmit easily between mammals it could
imply higher risk to humans," Perdue said.
The Austrian cat was among 170 kept in cages next to birds including a
swan that died of the disease and chicken and ducks found to have the
virus after they were culled last month.
The Austrian authorities began testing animals at the sanctuary for H5N1
after the outbreak there.
Germany last week reported the first European case of H5N1 bird flu in a
domestic cat on the northern island of Ruegen, an area where several wild
birds have died from the virus.
"There is still not any indication of cat to human transmission. That would
change everything, or if the virus started circulating among cats it would
be problematic," Perdue said.
If the virus circulated amongst cats, it could prove to be a "nightmare
surveillance-wise," he added.
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