Parotitis and Orchitis Cases due to Measles-Mumps-Rubella Vaccine

Although it is known that parotitis and orchitis cases may develop due to mumps strain included in the MMR vaccine, it has been shown that vaccines containing L-Z mumps strains may be associated with these side effects more frequently. In this article, we evaluated vaccine-related parotitis and orchitis cases in healthcare workers after measles-mumps -ru-bella (MMR) vaccine containing Edmonston-Zagreb measles, Leningrad-Zagreb mumps and Wistar Ra 27/3 measles strains. Twelve mumps seronegative healthcare workers developed parotitis and orchitis after the MMR vaccine con-taining L-Z mumps strain. The cases were confirmed serologically with mumps IgM positivity