Chikungunya is a different vírus but it is spread by the same mosquitoes. Like dengue, it normally produced higher fevers and worse pain than zika, which is one reason zika outbreaks have sometimes gone unnoticed whem dengue and chikungunya have been circulating at the same time. Researchers are still not sure how the zika vírus made its way to Brasil. Some say it could have arrived during the word cup in 2014, whem Brazil welcomed players, fans and others from around the word. Others think the vírus my have come during a canoe race weeks later, whem paddlers from french Polynesia arrived in Rio de Janeiro. New York Times
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