Adult Measles Surge Tests Vaccination Gaps and Clinical Vigilance

Measles cases in the U.S. are nearing 3,300 with a growing share among adults over 20, and adults are now hospitalized at higher rates than children in this wave. Pennsylvania data illustrate a rising adult burden and even deaths, underscoring that measles is not just a pediatric disease. Experts attribute spread to vaccine hesitancy and waning protection from older vaccines, though two MMR doses are about 97% protective. There is no antiviral treatment for measles, and adults can face serious complications such as pneumonitis and liver involvement. Clinicians should routinely assess immune status and offer boosters when appropriate, while respecting contraindications for pregnant or immunocompromised patients. Universal vaccination remains the best defense to protect vulnerable populations and curb transmission.