AI Article Synopsis
- The study investigated the presence of poliovirus types in urban sewage in Cameroon following the withdrawal of Sabin type 2 from immunization in 2016.
- From January 2016 to December 2017, 517 sewage samples were tested, finding no wild or vaccine-derived polioviruses, but vaccine strains were still detected.
- The disappearance of Sabin type 2 from June 2016 onwards indicates successful elimination of WPVs and VDPVs in Cameroon, highlighting the need for ongoing environmental surveillance.
Article Abstract
Objective: Transmission of wild polioviruses (WPVs) and vaccine-derived polioviruses (VDPVs) have been interrupted in Cameroon since July 2014. Subsequently, Cameroon withdrew Sabin type 2 from routine immunization in April 2016. This study aimed to investigate the detection rates and overtime distribution of the types of PVs recovered from urban sewage in Cameroon.
Results: From January 2016 to December 2017, 517 sewage specimens originating from Yaounde (325 specimens) and Douala (192 specimens) were analyzed. No WPVs and VDPVs were isolated in this study. In contrast, vaccine strains of poliovirus were detected throughout the study period. Isolates Sabin types 1 and 3 were sporadically detected whereas Sabin 2 was found only from January to May 2016 both in Yaounde and Douala. The absence of Sabin 2 in sewage specimens since June 2016 indicates its rapid disappearance after withdrawal from routine immunization in April 2016. This study provides substantial support to the observation that WPV and VDPVs have been successfully eliminated in Cameroon. However, it remains essential to maintain and extend high quality environmental surveillance as long as WPV reservoirs and VDPV outbreaks are detected in Africa.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6498607 | PMC |
| http://dx.doi.org/10.1186/s13104-019-4280-6 | DOI Listing |
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