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Articles on Yellow fever

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Municipal workers wait before spraying insecticide to prevent the spread of Aedes aegypti mosquito at Sambodrome in Rio de Janeiro, Brazil, January 26, 2016. Pilar Olivares/Reuters

Explainer: where did Zika virus come from and why is it a problem in Brazil?

Zika was discovered almost 70 years ago, but wasn’t associated with outbreaks until 2007. So how did this formerly obscure virus wind up causing so much trouble in Brazil?
The yellow fever mosquito Aedes aegypti, taking a bloodmeal. James Gathany/Public domain via Wikimedia Commons

Travelling to Brazil? Here’s what you should know about yellow fever

Of the dangers facing travellers to Brazil for the World Cup, yellow fever is one of the least likely to pose a real threat. But there are two important things to know about the illness. First, it’s a…

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