The vaccine this derived from was terminated Worldwide in a 2 week period starting April 2016 and case numbers are growing.
Below from the WHO - The vaccine was one of the Polio ones, it was very successful until it became the new threat. This derived version has been recorded as active in 2 humans for 6 years on the small test number subjects. Given the termination date of that vaccine and the case numbers in 2020, I think it is fair to say the data should be reviewed on this Polio variant.
"A global update on circulating vaccine-derived poliovirus type 2 (cVDPV2) outbreaks and events is summarized below, as of February 2021.
In 2020, 959 human cases of circulating vaccine-derived poliovirus type 2 (cVDPV2) and 411 cVDPV2-positive environmental samples were reported globally from 27 countries, of which 21 countries were from the African Region and six countries from reported from the regions of the Eastern Mediterranean, Europe and the Western Pacific. The number of cVDPV cases and environmental samples increased in 2020 compared to 2019 when 366 cVDPV2 cases and 173 cVDPV2-positive environmental samples were reported."
https://www.who.int/emergencies/dise...-global-update