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MMR Vaccine Q & A

from IAC Express News

Q: In regard to the current measles outbreak, some people are saying that children who have not had the vaccine should pose no threat to vaccinated people. It is my understanding that during an outbreak, vaccinated people can still contract it. Am I correct?

A: You are correct that vaccinated people can still be infected with infections against which they are vaccinated. No vaccine is 100 percent effective. Vaccine effectiveness varies from greater than 95 percent (for diseases such as measles, rubella, hepatitis B) to much lower (influenza this year 23 percent, and 60 percent in years with a good match of wild and vaccine viruses, and the acellular pertussis vaccines after 5 years or so provide only about 70 percent protection). more

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