At the start of the flu season, the main strain was influenza A H1N1, but now a more severe strain, influenza A H3N2, accounts for nearly half of all the new cases, the CDC says.
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At the start of the flu season, the main strain was influenza A H1N1, but now a more severe strain, influenza A H3N2, accounts for nearly half of all the new cases, the CDC says.
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