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A new study demonstrates that outbreaks of mosquito-borne viruses Zika and Chikungunya generally occur about three weeks after heavy rainfall. Researchers also found that Chikungunya will predominate over Zika when both circulate at the same time, because Chikungunya has a shorter incubation period - just two days, versus 10 days for Zika. The latter finding explains why a late-2015 Zika epidemic in Rio de Janeiro ended while the number of Chikungunya cases increased in February 2016. [Source: University of California, Los Angeles]
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