Chikungunya is a mosquito-borne viral disease that is transmitted from human to human by the bites of infected female mosquitoes. Most commonly, the mosquitoes involved are Aedes aegypti and Aedes albopictus, two species which can also transmit other mosquito-borne viruses, including dengue.

These mosquitoes can be found biting throughout daylight hours, although there may be peaks of activity in the early morning and late afternoon. After the bite of an infected mosquito, onset of illness occurs usually between 4 and 8 days but can range from 2 to 12 days.