Majority of Mumps Cases Are Among the Vaccinated, Cdc Finds (2021)
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Vaccine EffectivenessMumps OutbreakPublic Health
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The CDC finds that most mumps cases are among the vaccinated, but commenters note that this is expected given the high vaccination rate and that vaccines still reduce spread and severity.
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Since such a vast majority of people have gotten MMR vaccines, this is exactly what we expect right? The vaccine is still doing it's job in vastly reducing spread and reducing severity when people do get mumps.