Measles boosters not usually needed, experts explain immunity via memory cells
Giant pharmacies are expanding measles vaccination as cases rise; most vaccinated people don’t need a booster, since measles immunity relies on memory cells that activate when needed. Protection levels vary by birth year and vaccination history, with higher protection for those vaccinated after 1989 (two doses). Breakthrough cases can occur, but vaccination generally prevents severe illness and hospitalization. Boosters are not required but aren’t harmful, and questions about protection are encouraged at pharmacies.
