There are four serotypes of this virus found in tropical and most subtropical areas. There is no prophylactic treatment as there is for Malaria. It takes 3 to 15 days from exposure to the onset of symptoms. The symptoms include an abrupt onset of chills, fever, headache, severe arthralgia or muscle and joint pains and often upper respiratory symptoms.
Acquired immunity is prolonged and often life-long.
The course of the illness is in stages. Sudden onset of fever, headache and pain. There is a steady fever for 3 - 4 days before it falls. Pain or soreness in eyes and everywhere especially in areas where old injuries had occurred. Nausea, change in taste, vomiting and diarrhea may occur.