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The World's Worst Travel Diseases

2 of 11

Photo: iStock

Giardiasis

What it is: An intestinal parasite that causes gastroenteritis, it’s usually contracted by travelers by consuming contaminated water or food. And don’t just blame street food—hikers and backpackers have picked up this awful bug in wilderness areas worldwide.

Where it’s found: Everywhere.

How to avoid it: Stick to bottled or boiled water and be wary of uncooked vegetables. (See the CDC’s recommendations on safe food and water.)

The World's Worst Travel Diseases

2 of 11

Travel + Leisure

The World's Worst Travel Diseases

Giardiasis

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