This is the worst Ebola outbreak in history. Here’s why you should be concerned.

Ebola - Photo by Thomas W. Geisbert

It’s concentrated in three small West African states: Sierra Leone, Liberia and Guinea, where reports of Ebola infections first emerged in February. The outbreak has claimed more than 670 lives and, worryingly, infected medical personnel attempting to stop its spread. A prominent Liberian physician died Sunday.

What’s particularly scary, though, was the recent death of a Liberian man in Lagos, the bustling coastal mega-city in Nigeria, Africa’s most populous country. The man, a consultant for the Liberian government, had traveled from Liberia through an airport in Lome, the capital of Togo, before arriving in Nigeria. The hospital where he died is under lockdown, and the WHO has sent teams to Togo and Nigeria.

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