Surveillance report describes circulating vaccine-derived poliovirus outbreaks from 2021 to 2022

This was a surveillance report documenting outbreaks of circulating vaccine-derived polioviruses (cVDPVs) worldwide during the period from January 2021 through December 2022. The report described the occurrence of these outbreaks but did not report specific population details, sample sizes, or quantitative measures of outbreak magnitude, geographic distribution, or strain characteristics.

No intervention, exposure, or comparator was reported in the input. The main result was that cVDPV outbreaks were described during the surveillance period. No numerical data on case counts, attack rates, or genetic sequencing details were provided. Safety and tolerability information, including adverse events, was not reported.

Key limitations include the descriptive nature of the report and the absence of specific quantitative data, population details, and methodological information about the surveillance system. The practice relevance is not explicitly stated, but the report serves as a reminder that cVDPV transmission remains a public health concern requiring sustained surveillance and immunization efforts to prevent paralysis.