Why are there many vaccinated kids in measles outbreaks?

In 1998, a team of researchers in Great Britain published a study examining the relationship between the MMR (measles, mumps, rubella) vaccine and autism. Or, as <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140673697110960/fulltext" rel="noopener ugc nofollow" target="_blank">the study paper</a> put it, “We identified associated gastrointestinal disease and developmental regression in a group of previously normal children, which was generally associated in time with possible environmental triggers.” One of those triggers was the MMR vaccine. If you clicked on the link to the paper, you might have noticed the paper is retracted. It was retracted because <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831678/" rel="noopener ugc nofollow" target="_blank">it was found to be fraudulent</a>, <a href="https://briandeer.com/mmr/lancet-summary.htm" rel="noopener ugc nofollow" target="_blank">filled with inaccuracies and with questionable ethics practices</a>. Nevertheless, the damage was done. Anti-vaccine organizations and activists showcased the study and its authors as evidence that vaccines cause autism. <a href="https://epiren.medium.com/why-are-there-many-vaccinated-kids-in-measles-outbreaks-ac7aab8e81b4">Website</a>