Measles is scary. Breakthrough measles is even scarier.
https://www.theglobeandmail.com/life/article-measles-breakthrough-vaccine-joy-spearchief-morris/
Measles is scary. Breakthrough measles is even scarier.
https://www.theglobeandmail.com/life/article-measles-breakthrough-vaccine-joy-spearchief-morris/
Check out @Akuchimoya@startrek.website 's comment. A person’s immune system may not “remember” the vaccine, so they need to be vaccinated again.