Why Do Humans Get Sick After Traveling?

Your body is a superhero, but it gets tired when fighting new villains. Imagine you're at home playing with your favorite toys, that's like being in a familiar place. But if you suddenly go to a different city and meet new people who are carrying germs, it's like facing new enemies. Your body might not be ready for them right away, so you feel sick.

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Examples

  1. A child on a plane sneezes near you, suddenly, you feel a little sick.
  2. You arrive at your hotel and start coughing because of the germs in the air.
  3. After visiting a crowded market in another country, you get a sore throat.

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