The US has seen a rise in measles cases nationwide, with 222 reported cases as of March 6. While the measles vaccine is considered effective, some individuals may be wondering if they need a booster shot.
According to Dr. Alex Dresden, a family medicine physician at SSM Health, the vaccine’s effectiveness depends on several factors. Those who received both doses are 97% effective in preventing the disease. However, individuals who got vaccinated before 1968 or those with weakened immune systems, such as immunocompromised people or healthcare workers, should discuss booster shots with their doctor.
The CDC recommends two doses of the MMR vaccine for children, starting at 12-15 months and again at 4-6 years old. Unvaccinated adults need at least one dose, but two doses are ideal.
The current outbreak is largely attributed to lower vaccination rates. The virus can survive in the air for up to two hours and is highly contagious. Nine out of 10 unvaccinated individuals will get infected if exposed, with one in five requiring hospitalization.
Symptoms of measles include high fever, cough, runny nose, red eyes, and a characteristic rash. Since symptoms may not appear until seven days after infection, it’s essential to be aware of the risks.
The resurgence of measles cases is largely due to travelers bringing the disease back from abroad. According to Dr. Dresden, vaccination is key in preventing this highly contagious and preventable virus.
Source: https://www.ssmhealth.com/newsroom/blogs/ssm-health-matters/march-2025/do-you-need-a-measles-booster