Mutated Virus Sparks Early US Flu Season

This year’s flu season has started unusually early, primarily affecting Pacific states with a surge of cases driven by an H1N1 strain that has acquired a gene mutation allowing it to evade immunity. While the vaccines target this virus, the mutation means they may be less effective, prompting experts to recommend vaccination as soon as possible. Public health officials are closely monitoring the spread, which may lead to a second wave later in the season.

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