Webby, who is a researcher at St Jude Children's Research Hospital in the US city of Memphis, told AFP it was"absolutely" the largest outbreak of avian influenza the world had seen.
"That does increase the potential that even just by chance" the virus could"pick up genetic traits that allow it to be more of a human virus," he said. Ian Brown, virology head at the UK's Animal and Plant Health Agency, said there has not yet been"clear evidence that this virus is easily sustaining in mammals."
But many other countries have been reluctant due to import restrictions in some areas, and fears vaccinated birds that nonetheless get infected could slip through the net.France recently said it hopes to start vaccinating poultry as early as autumn this year.
Belgique Dernières Nouvelles, Belgique Actualités
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