Malaria is a disease caused by protozoa that infects over 400 million people worldwide each year, most commonly in Africa. It is transmitted through the bites of infected female Anopheles mosquitoes. Symptoms include shivering, vomiting, headache, and high fever in cycles. Prevention methods include wearing long, light-colored clothing; applying insect repellent; and sleeping under mosquito nets, especially for those traveling to Africa.