I'm not sure if there is an official source, but with GOogle I found that 91% of the children are vaccinated with MMR https://www.statista.com/statistics/385577

I'm not sure if there is an official source, but with GOogle I found that 91% of the children are vaccinated with MMR https://www.statista.com/statistics/385577/mmr-vaccination-rate-among-us-children-aged-19-35-months/?srsltid=AfmBOopiEGVAxSKd176PsSCk0vQhbwbqOyhf-5gr3m2bR-MNhvci8jaA https://www.statista.com/statistics/385577/mmr-vaccination-r... So 91% vaccinated -> 12% ill -> something something -> 12/91 = 0.13 So 8% unvaccinated -> 88% ill -> something something -> 88/8 = 11.0 So the risk of uncvacinated people is like 100 higher. I'd expect a similar analysis in Nature site.