Chikungunya virus has caused substantial epidemics in the tropics, often with an even worse impact than dengue, but infections can also be relatively mild or even undetected. A study conducted in Brazil by researchers at the São José do Rio Preto Medical School (FAMERP) in São Paulo State shows that the virus circulated in the city silently for years. The number of cases was initially small but gradually rose in the period analyzed (2015–19). The findings underscore the importance of epidemiological surveillance to predict and prevent epidemics.
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