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Why does flu tend to strike in winter?

Despite being common, influenza is still not well understood by science.

Winter flu is a common and often predictable illness, but we still understand surprisingly little about it. These are the best theories for why it spreads in the coldest months.

The flu season arrives without fail during the coldest months each year, but scientists still don't know why the virus spreads so quickly over the winter. The best theories contradict much of what we commonly believe about the illness.