Monitoring poliovirus in environmental sewage in Sichuan province,2019-2022
Objective To evaluate for presence and transmission risk of polioviruses using environmental sewage surveillance in Sichuan province.Methods We obtained environmental sewage samples from six monitoring sites in Sichuan from August 2019 to December 2022 for poliovirus isolation and identification.Results From 90 environmental sewage samples,105 poliovirus strains and 160 non-polio enterovirus strains were isolated.All poliovirus isolates were Sabin-like strains,among which type Ⅰ,type Ⅱ,typeⅢ,and mixed type Ⅰ+Ⅲ polioviruses accounted for 18.10％(19 strains),0.00％(0 strains),77.14％(81 strains),and 4.76％(5 strains),respectively.Conclusions No wild poliovirus or vaccine-derived polioviruses were found in environmental sewage monitoring areas.These result provide supportive evidence of continued maintenance of polio-free status in Sichuan.
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