Chikungunya fever is a viral disease transmitted to humans by the bite of infected Aedes and Culex mosquitoes including the daytime-biting Aedes aegypti and Ae. albopictus species. Symptoms can include sudden onset of fever, chills, headache, nausea, vomiting, joint pain with or without swelling, low back pain, and rash. The symptoms are very similar to those of dengue but, unlike dengue, there is no hemorrhagic or shock syndrome form. This disease is almost always self-limited and rarely fatal. In addition to ongoing outbreaks on the Indian Ocean islands of Mayotte, Mauritius, Réunion (territory of France), and the Seychelles, a chikungunya fever outbreak has been reported from three states in India (Karnataka, Maharastra, and Andra Pradesh). Travelers to all these areas are recommended to take precautions to avoid mosquito bites.