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Sabin viruses isolated during May–October 2010 in 4 study sites in Mexico. VDPV2 was isolated in mixtures with Sabin 2 and 3 (3 samples), and in mixture with Sabin 1 and 2 (1 sample). None of the samples had Sabin 1 alone. Abbreviations: NPEV, nonpolio enterovirus; PV, poliovirus; S1, Sabin 1; S2, Sabin 2; S3, Sabin 3; VDPV1, type 1 vaccine-derived poliovirus; VDPV2, type 2 vaccine-derived poliovirus.
