Doctors Without Borders workers at an Ebola treatment center in Guinea in April, shortly after the virus was recognized. Credit Kjell Gunnar Beraas/Doctors Without Borders
By DENISE GRADY and SHERI FINK
The current Ebola outbreak, the largest ever, seems likely to surpass all previous known Ebola outbreaks combined, and epidemiologists predict it will take months to control.
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