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Online-Go Server (https://online-go.com) 
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in 2017, cases caused by vaccine-derived poliovirus (cVDPV) outnumbered wild poliovirus cases for the first time, due to wild polio cases hitting record lows and relaxed vaccination levels. Most industrialized countries have switched to inactivated polio vaccine, which cannot revert
A vaccine-derived poliovirus (VDPV) is a strain of the weakened poliovirus that was initially included in oral polio vaccine (OPV) and that has changed over time and behaves more like the wild or naturally occurring virus. These viruses may cause illness, including paralysis.
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Nice, RIP polio, hopefully going the same way as smallpox. In a few decades I expect we’ll see the International “End Coronavirus Now” Tournament…
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