The World's Worst Travel Diseases
What it is: A potentially fatal disease caused by a parasite, usually transmitted by a bite from an infected mosquito. Chills and headaches are just two of its milder symptoms.
How to avoid it: Ask your doctor to prescribe the appropriate prophylaxis before traveling—usually mefloquine or chloroquine, depending where you’re going. And take measures to prevent mosquito bites, like wearing long sleeves and pants and protecting your skin with a repellent containing DEET.