Progress Toward Poliomyelitis Eradication — Nigeria, January 2018–May 2019

The number of wild poliovirus (WPV) cases in Nigeria decreased from 1,122 in 2006 to six WPV type 1 (WPV1) in 2014 (1). During August 2014-July 2016, no WPV cases were detected; during August-September 2016, four cases were reported in Borno State. An insurgency in northeastern Nigeria had resulted in 468,800 children aged <5 years deprived of health services in Borno by 2016. Military activities in mid-2016 freed isolated families to travel to camps, where the four WPV1 cases were detected. Oral poliovirus vaccine (OPV) campaigns were intensified during August 2016-December 2017; since October 2016, no WPV has been detected (2). Vaccination activities in insurgent-held areas are conducted by security forces; however, 60,000 unvaccinated children remain in unreached settlements. Since 2018, circulating vaccine-derived poliovirus type 2 (cVDPV2) has emerged and spread from Nigeria to Niger and Cameroon; outbreak responses to date have not interrupted transmission. This report describes progress in Nigeria polio eradication activities during January 2018-May 2019 and updates the previous report (2). Interruption of cVDPV2 transmission in Nigeria will need increased efforts to improve campaign quality and include insurgent-held areas. Progress in surveillance and immunization activities will continue to be reviewed, potentially allowing certification of interruption of WPV transmission in Africa in 2020.

[1]  F. Shuaib,et al.  Profile of polio-compatible cases in Nigeria, 2006–2016 , 2018, BMC Public Health.

[2]  J. Vertefeuille,et al.  Progress Toward Poliomyelitis Eradication — Nigeria, January–December 2017 , 2018, MMWR. Morbidity and mortality weekly report.

[3]  J. Okeibunor,et al.  Introduction of Inactivated Poliovirus Vaccine and Trivalent Oral Polio Vaccine/Bivalent Oral Polio Vaccine Switch in the African Region , 2017, The Journal of infectious diseases.

[4]  L. Hampton,et al.  Cessation of Trivalent Oral Poliovirus Vaccine and Introduction of Inactivated Poliovirus Vaccine - Worldwide, 2016. , 2016, MMWR. Morbidity and mortality weekly report.

[5]  S. Tegegne,et al.  Contribution of Environmental Surveillance Toward Interruption of Poliovirus Transmission in Nigeria, 2012–2015 , 2016, The Journal of infectious diseases.

[6]  O. Diop,et al.  Tracking Progress Toward Polio Eradication — Worldwide, 2013–2014 , 2015, MMWR. Morbidity and mortality weekly report.

[7]  Walter A Orenstein,et al.  Polio vaccination: past, present and future. , 2015, Future microbiology.

[8]  F. Mahoney,et al.  Progress Toward Poliomyelitis Eradication — Nigeria, January 2013–September 2014 , 2014, MMWR. Morbidity and mortality weekly report.

[9]  F. Mahoney,et al.  Progress toward poliomyelitis eradication in Nigeria. , 2014, The Journal of infectious diseases.

[10]  Stephen L Cochi,et al.  Global polio eradication initiative: lessons learned and legacy. , 2014, The Journal of infectious diseases.

[11]  F. Mahoney,et al.  Progress Toward Poliomyelitis Eradication — Nigeria, January 2012–September 2013 , 2013, MMWR. Morbidity and mortality weekly report.

[12]  M. Pate,et al.  Outbreak of Type 2 Vaccine-Derived Poliovirus in Nigeria: Emergence and Widespread Circulation in an Underimmunized Population , 2011, The Journal of infectious diseases.