CDC warns two Americans have been infected with ‘dual mutant’ flu strains that is immune to some drugs

At least two Americans were infected with a new strain of H1N1, which contains two new major mutations, last flu season, a study found, in a warning sign it may be gaining a foothold. At least two Americans were infected with a new strain of H1N1, which contains two new major mutations, last flu season, a study found, in a warning sign it may be gaining a foothold.