A baby is temporarily marked to verify that he received the polio vaccine in Nigeria, in January 2015. In 2016, there were only four cases of wild poliovirus in sub-Saharan Africa, all detected in Nigeria, the last polio-endemic country in Africa. According to WHO, as of 2019, Nigeria has gone three years without a case of polio, putting it on the brink of being declared free of the disease.

First published in the August 21, 2019, 9:24 p.m. edition

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