This is a recurring question for many scientists. Researchers in New York have demonstrated that the flu virus is best transmitted in cold, dry weather.
Unlike colds (which are transmitted by contact), the flu virus is airborne. If it’s too hot, it dies, and if it’s too humid, it falls like a drop of water.
So you can catch the flu from November to March in the northern hemisphere, and from May to September in the southern hemisphere. In the tropics, on the other hand, there’s hardly any flu– too hot and too humid!
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