bird flu virus in crow

house crow found dead in a crowded district in Hong Kong last week has tested positive for the highly pathogenic H5N1 bird flu virus, a government spokeswoman said on Monday.

The appearance of the virus in Hong Kong, more active in the cooler months between October and March, is closely watched as it may indicate the level of activity of the virus in mainland China, which has a poultry population of 13 billion.

The virus is endemic in poultry in parts of Asia but experts fear it will mutate into a form that is easily passed from human to human, sparking a pandemic which could kill millions of people.