Estimation of the poliovirus type 2 immunity gap in South Africa
Brown LR, Bingham JL, Pulliam JRC, Mthombothi ZE, Sereo T, Kamupira M, Botha S, Molema K, Maseti E, Schönfeldt M, Mabhena N, Prabdial-Sing N, von Gottberg A, McCarthy K, van Schalkwyk C
