Progress Toward Polio Eradication — Worldwide, 2013–2014

Edna K. Moturi, MBChB; Kimberly A. Porter, PhD; Steven G.F. Wassilak, MD; Rudolf H. Tangermann, MD; Ousmane M. Diop, PhD; Cara C. Burns, PhD; Hamid Jafari, MD

Disclosures

Morbidity and Mortality Weekly Report. 2014;63(21):468-472. 

In This Article

Reported WPV Cases

All 416 WPV cases reported in 2013 were WPV1. Of these, 22% were cases detected in Pakistan and 62% were cases in new outbreaks after WPV1 importations into previously polio-free countries. As of May 20, during January–April 2014, the low transmission season for poliovirus, 82 WPV1 cases were reported globally from eight countries, an increase from 34 WPV1 cases reported from three countries during the same period in 2013 ( Table 2 ). During 2014, as of May 20, WPV1 has already spread internationally from three countries: in central Asia (from Pakistan to Afghanistan), the Middle East (Syria to Iraq), and in Central Africa (Cameroon to Equatorial Guinea). WPV type 3 (WPV3) cases have not been detected in Pakistan since April 2012 and in Nigeria since November 2012. No WPV type 2 cases have been detected anywhere in the world since 1999.

Afghanistan

In 2013, a total of 14 WPV1 cases were reported in 10 districts, a 62% decrease from 37 cases reported in 21 districts in 2012 and a 52% decrease in the number of affected districts. This is the lowest level of reported WPV since 2004; all but one case in 2013 and all cases in 2014 were reported from eastern Afghanistan and genetically linked to WPV importation from Pakistan. In 2013, only one case was reported from Helmand Province in southern Afghanistan, which had been the main region of Afghanistan where polio was endemic up to 2012. During January–April 2014, four WPV1 cases were reported, compared with two cases reported during the same period in 2013.

Nigeria

In 2013, 53 WPV1 cases were reported in 30 districts, a 57% reduction from the 122 WPV cases (109 WPV1 and 19 WPV3 cases) in 60 districts reported in 2012, and a 50% decrease in the number of affected districts. During January–April 2014, Nigeria reported three WPV1 cases, an 88% decrease compared with 16 cases reported during the same period in 2013. In 2013, SIAs were suspended temporarily in some areas of armed conflict in northeastern Nigeria.

Pakistan

In 2013, 93 WPV1 cases were reported in 23 districts, a 60% increase from 58 WPV cases (55 WPV1 cases, two WPV3 cases, and one case with WPV1 and WPV3 coinfection) in 28 districts in 2012, and an 18% reduction in the number of affected districts. During January–April 2014, Pakistan reported 66 cases, compared with eight cases reported during the same period in 2013. Since mid-2012, local authorities have imposed a complete ban on conducting SIAs in North Waziristan, South Waziristan, and one part of northwestern Pakistan, and in 2013, SIAs were suspended temporarily in some areas of Pakistan because of risks for violence.

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