The warning comes after Britain recorded its first case of the H5N1 strain on a commercial turkey farm.
Doctor David Nabarro, a United Nations official, says he doesn't expect the virus to spread to neighboring farms in Britain because of the quick containment measures put in place by the government.
He says countries around the world where the virus isn't native would likely see more cases in poultry before June spread mostly by migrating birds.
Nabarro stresses the risk to human health remains very small since the virus is not easily transferred from birds to humans.
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