A 'dual mutant' virus has been detected in the US that could make medications less effective, officials are warning.
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.
Across the world, 101 cases were detected out of 15,000 infections analyzed — or 0.67 percent — in five continents, in another sign it is spreading.
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