Chinese health officials are struggling to contain an outbreak of the chikungunya virus (CHIKV), a mosquito-borne infection that causes severe pain in the muscles and joints of its victims.

Chikungunya, which flares up periodically in Africa and Asia but can also be found in Europe and the Americas, derives its name from a Tanzanian word that means “bent over.” The name is a fair description of the chikungunya’s effect on humans, as the severe pain it causes in joints and muscles can leave victims contorted with agony.

CHIKV outbreaks usually fade when the infected population develops natural immunity, which tends to happen faster in small…

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