Woah, I just looked it up....I have never heard of this. According to a study 490,000 cases of paralysis were caused by the oral polio vaccine from 2000-2017. Wow.
Here’s what the WHO site says:
“Since 2000, more than 10 billion doses of OPV have been administered to nearly 3 billion children worldwide. As a result, more than 13 million cases of polio have been prevented, and the disease has been reduced by more than 99%. During that time, 24 cVDPV outbreaks occurred in 21 countries, resulting in fewer than 760 VDPV cases.”
https://www.who.int/news-room/q-a-detail/what-is-vaccine-der...
From article: We calculated the number of paralyzed children each year which exceeded the expected numbers (assuming a NPAFP rate of 2/100,000) and the results are displayed in Table 2. A total of 640,000 children developed NPAFP in the years 2000–2017, suggesting that there were an additional 491,000 paralyzed children above our expected numbers for children with NPAFP.
The OPV is still used in the few countries where there is polio in the wild because it does have advantages over the IPV.