Why do people in Boston get the flu when it's cold, while people in Senegal get sick when it's hot? Humidity is a big part of the explanation. But how flu spreads in the tropics and more temperate climates appears to be different.
Source: http://www.npr.org/blogs/health/2013/03/08/173816815/flu-risk-and-weather-its-not-the-heat-its-the-humidity?ft=1&f=1003
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