The source is mosquito.
Chikungunya is most common in tropical, especially in Southeast Asia. This type of mosquito found in the district, especially in the crowded because there is a water source for breed, but in rural areas, especially at the start, congestion, it will find that there are more endemic. Air pressure also affects the well-being of mosquitoes. Found in higher level areas no more than 500 metres of sea water to a population density of many mosquitoes. But, in a mountainous area, is this type of mosquito found less.