Why the Flu virus is seasonal

Summarizing this article from TIME, there are three main reasons why the Flu is (mostly) seasonal:

  1. The virus is more stable and can remain airborne longer in cold, dry air.
  2. People stay inside more when it’s cold, where they quickly become vitamin-D deficient.
  3. When people are inside more, they are in closer and more regular contact with other infected people.

Countries with a perpetually tropical climate have consistent rates of infection all year long.

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