Transmission Cycle

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The human infections are acquired by the bite of infected Ae. aegypti /Ae. Albopictus mosquitoes, which are day biters and epidemics are sustained by human-mosquito-human transmission. The incubation period (time from infection to illness) can be 2-12 days, but is usually 3-7 days. Acute Chikungunya fever typically lasts a few days to a couple of weeks, but some patients have prolonged fatigue lasting several weeks. Additionally, some patients have reported incapacitating joint pain, or arthritis which may last for weeks or months. The prolonged joint pain associated with CHIKV is not typical of dengue. Co-circulation of dengue fever in many areas may mean that Chikungunya fever cases are sometimes clinically misdiagnosed as dengue infections, therefore the incidence of Chikungunya fever could be much higher than what has been previously reported. No deaths, neuro-invasive cases, or hemorrhagic cases related to CHIKV infection have been conclusively documented in the scientific literature.