Stock Photo - Cheick Mohamed Keita (l), a doctor from Doctors Without Borders conducts a follow-up examination with Youssouf, a participant in an ebola vaccine study, in Conakry, Guinea, 10 November 2015. PHOTO: KRISTIN PALITZA/DPA | usage worldwide. - Conakry/Guinea

Stock Photo: Cheick Mohamed Keita (l), a doctor from Doctors Without Borders conducts a follow-up examination with Youssouf, a participant in an ebola vaccine study.

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