Drug-resistant "dual mutant" flu strains, first detected in Hong Kong, now being tracked in U.S.

Drug-resistant "dual mutant" flu strains now being tracked in U.S., CDC says The two genetic changes to H1N1 could cut the effectiveness of the main flu antiviral doctors turn to. CBS News

At least two human cases of the new so-called "dual mutant" strains of H1N1 influenza have been detected in U.S. patients, the Centers for Disease Control and Prevention said Wednesday, with genetic changes that could cut the effectiveness of the main flu antiviral that hospitals rely on.

An analysis of the new H1N1 flu viruses with these two concerning mutations – which scientists call I223V and S247N, describing changes to key surface proteins of the virus – was published this week in the agency's Emerging Infectious Diseases journal.

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