Fact check: How long does protection from a measles vaccine last?

Does the Measles Vaccine Provide Lifetime Protection?

Referring to recent statements by U.S. Secretary of Health and Human Services RFK Jr., there has been concern about the longevity of measles vaccine protection. Experts agree that the MMR (measles, mumps, rubella) vaccine offers lifelong immunity in most cases. Unlike influenza or COVID-19, the measles virus hasn't changed significantly over centuries, so once vaccinated, individuals are generally protected for life.

Is the Measles Vaccine Safe and Effective?

The MMR vaccine has been credited with eradicating measles in the United States in 2000, underscoring its safety and effectiveness. Two doses provide about 97% protection, creating herd immunity when a large majority of the population is vaccinated. Approximately 3% may not respond fully, which is why achieving high vaccination coverage is critical.

Do You Need a Measles Booster?

For most, a single vaccination series at age 1 and 4 is sufficient for lifelong immunity. Exceptions include certain immunocompromised individuals or those vaccinated with inactivated measles vaccines before 1968, who may require additional doses. Currently, there is no need for routine booster shots for measles.

Why Herd Immunity Matters

High vaccination rates (around 95%) are essential to prevent outbreaks. Herd immunity protects those who cannot be vaccinated and helps eliminate the spread of the disease.

The Bottom Line

The most effective way to prevent measles is through the MMR vaccine. Vaccines remain the cornerstone of public health efforts to control and eradicate infectious diseases like measles.

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