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[Correspondence] Questionable efficacy of the rVSV-ZEBOV Ebola vaccine

We read with great interest the final report by Ana Maria Henao-Restrepo and colleagues (Feb 4, 2017, p 505)1 on the ring vaccination trial of an rVSV-vectored vaccine for Ebola virus disease (rVSV-ZEBOV). Briefly, among 2119 people who received the vaccine immediately, no cases of Ebola virus disease were identified in a period of 11 days (10–21 days after vaccination). By contrast, 16 cases were identified within the same time frame among 2041 people who did not receive the vaccine immediately.

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