not out of realm of possibility for parise and pomminville to get it despite getting the shots, the vaccine isn't 100% effective
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MMR vaccine is very safe and effective. The mumps component of the MMR vaccine is about 88% (range: 66-95%) effective when a person gets two doses; one dose is about 78% (range: 49%−92%) effective.
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https://www.cdc.gov/mumps/vaccination.html