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Erin Ross Dec 1
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"We have stopped making progress" fighting malaria

A worker fumigates buildings to control malaria in Sri Lanka in 2011. Photo: Eranga Jayawardena / AP Photo

There were 5 million more malaria cases in 2016 compared to the previous year, according to the World Health Organization. This is an abrupt change: the number of cases dropped over 60% from 2000-2015. "For the first time, we can confidently say that we have stopped making progress," Pedro Alonso, the director of the Global Malaria Programme at the World Health Organization tells Amy Maxmen at Nature.

Why it matters: According to the WHO, more than half the world's population is at risk of contracting malaria. In 2015, over 200 million people were infected with malaria and nearly half a million died, mostly children under the age of 5.