Second strain of flu may complicate picture
May 6, 2009
A second strain of influenza, one of the seasonal strains, may have mutated and may be complicating the picture in Mexico, Canadian researchers
reported on Wednesday.
They have found a strain of the H3N2 virus that appears to have made a shift and could have complicated the flu picture in Mexico,
epicenter of an outbreak of a new strain of the H1N1 swine flu virus.
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