[Acute parotitis in children previously vaccinated against mumps].

Children who had previously received Morbilli-(Mumps) Rubella (MMR) vaccine developed parotid swelling which was diagnosed as acute parotitis 7 days to 2 years following inoculation. Blood samples from each of the patients were tested for the following virological parameters: Mumps-virus, Parainfluenza-viruses (PIV) type 1., 2., 3., Respiratory Syncytial Virus (RSV), Epstein Barr Virus Capsid Antigen (EBVCA) IgM, IgA, IgG immunofluorescent test (IFT) and EBVCA IgM, IgG ELISA (HUMAN); Epstein Barr Virus Early Antigen (EBV EA) IgG IFT; Adenovirus, Influenza A, B Complement Fixation (CF) test. Some of the sera were examined for CMV IgM, IgG ELISA (Organon Teknika) and Human Parvovirus B19 IgM, IgG recombinant ELISA (Bender) too. Nine cases were interpreted as a clinical reaction of mumps vaccination. Beside the clinical reaction of mumps vaccination. Beside the clinical reaction of mumps vaccination, the etiological role of PIV-1, PIV-2, PIV-3 and PIV-1,2 was confirmed in four, three, one and one patients, respectively. The alonely etiological agent was the PIV-2 in four and PIV-2 and Epstein-Barr virus together were in one patients, respectively. The etiology was unknown in one patient. The results show the importance both of the broad spectrum precise serologic studies and of the skillful interpretation in the exact diagnosis of the acute parotitis to identify parotitis either as a consequence of the mumps vaccine or vaccine failure. The correct diagnosis of acute parotitis can influence the booster mumps vaccination practice too.