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How to avoid contracting infectious diseases while traveling
Educate yourself.
While you're planning your trip, research the infectious diseases endemic to the area you want to visit. The center for disease control and prevention (cdc) offers a useful webpage that allows you to easily identify illnesses by country.
Knowing the diseases you may encounter will allow you to prepare properly! Talk to your doctor. Visit your doctor 4-6 weeks before you leave for your trip.