
Measles Outbreaks: Understanding the Threat to Herd Immunity
Measles outbreaks are on the rise in the U.S. due to declining vaccination rates, which are compromising herd immunity. Experts warn that vaccination levels for the MMR vaccine, which protects against measles, mumps, and rubella, have dropped below the 95% threshold needed for herd immunity, leading to an increase in measles cases. Additionally, a record number of kindergarten students have received exemptions from key vaccines, with nonmedical exemptions on the rise. This trend poses a significant risk of further measles outbreaks across the country.













