Chikungunya virus is spread to people by the bite of an infected mosquito. The most common symptoms of infection are fever and joint pain. Other symptoms may include headache, muscle pain, joint swelling, or rash. Outbreaks have occurred in countries in Africa, Americas, Asia, Europe, and the Caribbean, Indian and Pacific Oceans. There is a risk the virus will be spread to unaffected areas by infected travelers. There is currently no vaccine to prevent or medicine to treat chikungunya virus infection. Travelers can protect themselves by preventing mosquito bites. When traveling to countries with chikungunya virus, use insect repellent; wear long-sleeved shirts and pants; and stay in places with air conditioning or that use window and door screens.