n August, Rio will become South America’s first city to host the Summer Olympics and there are mounting fears that the mega-event will be disrupted. Foreign governments are lining up to urge tourists to avoid countries hosting the Zika-carrying mosquito, and Brazil itself has specifically advised pregnant women not to come to the Olympics. Ahead of Rio’s Carnival, city authorities announced a program of fumigation and eradication of potential mosquito breeding sites that will intensify in the run-up to the Olympics. Authorities are also pointing out that in six months, it will be the southern hemisphere winter, meaning many fewer mosquitoes. Canceling the Games, said Brazilian Sports Minister George Hilton on Thursday, “is not under discussion.”