“Dual mutant” flu strains with some resistance to antiviral drug present in U.S.

The CDC says no less than two circumstances of so-called "dual mutant" flu strains have been detected within the United States. The strains have genetic adjustments that might impression the effectiveness of the principle flu antiviral that hospitals depend on, generally offered underneath the model Tamiflu. Dr. William Schaffner, professor of infectious ailments at Vanderbilt University Medical Center, joined CBS News to debate the virus.

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