WASHINGTON (Reuters) - The new pandemic H1N1 influenza was circulating undetected in pigs for at least a decade before it jumped to people, and much better surveillance is needed among both pigs and people, an expert said on Tuesday.
Molecular tests show the swine flu virus made a mutational jump as it passed from pigs to humans, which apparently happened recently, Michael Worobey of the University of Arizona told a meeting of flu experts sponsored by the U.S. Institute of Medicine.
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