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Chikungunya virus (CHIKV) is a mosquito-borne alphavirus that causes major epidemics of rash, fever, and debilitating arthritis. Currently, there are no vaccines or antivirals available for prevention or treatment. We therefore generated 2 live-attenuated vaccine candidates based on the insertion of a picornavirus internal ribosome entry site (IRES) sequence into the genome of CHIKV. Vaccination of cynomolgus macaques with a single dose of either vaccine produced no signs of disease but was highly immunogenic. After challenge with a subcutaneous inoculation of wild-type CHIKV, both vaccine candidates prevented the development of detectable viremia. Protected animals also exhibited no significant changes in core body temperature or cardiovascular rhythm, whereas sham-vaccinated animals showed hyperthermia, followed by sustained hypothermia, as well as significant changes in heart rate. These CHIKV/IRES vaccine candidates appear to be safe and efficacious, supporting their strong potential as human vaccines to protect against CHIKV infection and reduce transmission and further spread.

Chikungunya Vaccine Candidate Is Highly Attenuated and Protects Nonhuman Primates Against Telemetrically Monitored Disease Following a Single Dose