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OPV circulation in Mexico following an NIW by serotype. This graph contains data on shedding of specific OPV serotypes from all 3 NIWs combined. Of note, 30 samples contained more than 1 serotype, so the sum of the frequency of the 3 serotypes sometimes exceeds the total percentage of stools containing OPV strains. Abbreviations: NIW, National Immunization Weeks; OPV, oral polio vaccine.
