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Mumps outbreaks keep happening, even among vaccinated groups. Why? Our guest, Joseph Lewnard, and his coauthor, Yonstan Grad, probed studies of mumps vaccine efficacy carried out over five decades. They show that the fault, dear clinician, is not in our vaccines or new viral strains, but in ourselves. Our bodies slowly lose their immune response after vaccination, and about 25 years after the last vaccine dose, it’s gone. Listen in. Links: Science Translational Medicine study CDC recommends a third dose of MMR vaccine in an outbreak The post Podcast 220: Mumps outbreaks — blame waning protection, not new viruses or bad vaccines first appeared on Clinical Conversations.