Much of the concern this flu season is coming from the spread of subclade K, a subtype of influenza A. Similar subtypes have historically caused more hospitalizations and deaths than other strains.
Experts say they are feeling "nervous" as Australia approached this year's flu season, with a new, fast-moving strain of ...
Key TakeawaysThis season's flu vaccine didn't work as well as usual, officials sayA new virus strain did not match the shot ...
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