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Over 800 measles cases have been reported in the U.S. this year, primarily in West Texas. Most cases involve unvaccinated individuals, but a small percentage are breakthrough infections in those partially or fully vaccinated. Experts emphasize the MMR vaccine's high effectiveness (97% with two doses), noting that breakthrough infections are typically milder. While some claim vaccination didn't prevent their illness, this might be due to incomplete vaccination or individual immune responses. Factors like vaccine timing, genetic variations, and pre-existing conditions can influence immune response. Scientists suggest further research is needed, especially with rising vaccine hesitancy.

Prepared by Olivia Bennett and reviewed by editorial team.