Last data update: May 13, 2024. (Total: 46773 publications since 2009)
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Update on vaccine-derived polioviruses worldwide, January 2015-May 2016
Jorba J , Diop OM , Iber J , Sutter RW , Wassilak SG , Burn CC . Wkly Epidemiol Rec 2016 91 (31) 365-375 This report updates previous surveillance summaries and describes vaccine-derived polioviruses (VDPVs) detected worldwide during January 2015-May 2016. The update includes new circulating VDPV (cVDPV) outbreaks in Myanmar, Laos, Ukraine and Guinea, and sharply reduced cVDPV2 in Nigeria and Pakistan. 21 newly identified persons in 10 countries were found to excrete immunodeficiency-associated VDPVs (iVDPVs), and a patient in the UK was still excreting an iVDPV in 2015 after >29 years of chronic infection. Ambiguous VDPVs (aVDPVs) were found among immunocompetent persons and environmental samples in 19 countries. In response to the observation that the large majority of VDPV isolates are type 2, WHO coordinated the worldwide replacement of trivalent OPV (tOPV) with bivalent OPV (bOPV; types 1 and 3) in April 2016, preceded by the introduction of at least one dose of inactivated poliovirus vaccine (IPV) into routine immunization schedules in all high-risk countries. |
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