Researchers who examined swine flu viruses among pigs in Hong Kong say the viruses likely entered swine populations in southern China when it started importing pigs from North America and Europe in 2001 to improve local breeds. The European H1N1 strain similar to avian flu could be the most problematic among the three virus families that are endemic in southern China pigs, because of a lack of human antibodies to fight it, the researchers report in the journal Nature.

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