Avian flu extended its spread across Europe as Poland confirmed its presence in wild birds on Monday and experts from the World Health Organization (WHO) met to discuss the threat of a human influenza pandemic. China said on Sunday the H5N1 virus had killed a man in the southern Guangdong province, which borders Hong Kong. There had been no reported outbreaks in birds in the area where he died and experts in Hong Kong urged authorities to find the source. Full Story