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Coverage with polio vaccines by year and study site, Mexico, 2009–2011. A, Percent of children aged 12–23 months who had completed immunization with pentavalent vaccine containing inactivated polio vaccine, according to their age (eg, received 3–4 doses). B, Percent of children 1–4 years of age administered OPV during the campaigns conducted in February 2009, June 2009, February 2010, and May 2010. Abbreviation: OPV, oral polio vaccine.
