https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121585/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121585/ From article: We calculated the number of paralyzed

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121585/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121585/ 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.