On the trail of yellow fever

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Science  18 Aug 2017:
Vol. 357, Issue 6352, pp. 637-641
DOI: 10.1126/science.357.6352.637

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Brazil recently experienced its worst outbreak of yellow fever in decades, with 792 confirmed cases. And beyond the many deaths, yellow fever has left Brazilians feeling edgy as well. Over the past 8 months, they've endured vaccine shortages, lurid media stories, and the occasional slaughter of innocent monkeys. To stem such problems, scientists have scoured this massive country to figure out where the virus lurks and how it's spreading—knowledge vital to fighting future outbreaks as well. But fear remains, especially the fear that yellow fever will ravage the megacities along Brazil's east coast—or push even beyond that.