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Measles Surges: Are You Protected?
22 Sep
Summary
- US measles cases at a 30-year high, with 3,471 reported this year.
- Adults are increasingly affected, comprising 38-40% of cases.
- Two-dose MMR vaccine is highly effective; boosters generally not needed.
Measles cases in the United States have surged to their highest point in three decades, with 3,471 infections reported as of 2026. This dramatic increase follows a previous 30-year high in 2025 with 2,289 cases, a stark contrast to the 85 cases recorded in 2000. Originally eliminated in the U.S. in the 2000s, the virus is now circulating domestically, posing a significant risk due to its extreme contagiousness.
Experts note that measles can lead to severe complications, including death, pneumonia, and encephalitis. While often associated with children, adults are increasingly falling ill; one of the four measles-related deaths this year involved a 40-year-old unvaccinated woman. In fact, adults comprised 38% to 40% of measles cases in 2026 and just over half of hospitalizations in 2025.
The measles, mumps, and rubella (MMR) vaccine, administered in two doses, is highly effective, offering about 97% protection after both doses. For individuals unsure of their vaccination status, checking immunization registries or consulting healthcare providers is recommended. While lifelong immunity is typically achieved with two doses, those vaccinated between 1963 and 1967 may need an additional MMR dose as that vaccine version was not fully effective.
