FIGURE 1.

Number of cases of wild poliovirus types 1 (WPV1), 3 (WPV3), 1 and 3 (WPV1/WPV3), and circulating vaccine-derived poliovirus type 2 (cVDPV2), type of supplementary immunization activity conducted, and type of vaccine used, by month — Pakistan, 2010–2013*

Abbreviations: NID = national immunization days; SNID = subnational immunization days; mOPV = monovalent oral poliovirus vaccine; bOPV = bivalent oral poliovirus vaccine; tOPV = trivalent oral poliovirus vaccine.

* Data as of November 4, 2013.