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As a measure for the prevention and control of nosocomial infections in medical school students, we examined the students' titers of antibodies to measles, rubella, varicella, and mumps viruses to determine whether vaccination was required. We also analyzed and discussed correlations among antibody titers to the viruses. Subjects were 363 Juntendo University students, ranging from freshmen to seniors. EIA was used to measure IgG antibody titers. Eight subjects (2.2%) had negative titers for measles, 36 (9.9%) for rubella, 8 (2.2%) for varicella, and 10 (2.7%) for mumps. Seronegative subjects were vaccinated against each virus and high seroconversion rates were obtained: 100% for measles and rubella, 67% for varicella, and 89% for mumps. In addition, we used Pearson's test to search for correlations among the antibody titers for each virus. A weak correlation was observed among antibody titers for measles, rubella, and mumps but not for varicella. These results suggest that MMR vaccine might be effective in people with low levels of antibody to measles, rubella, and mumps.

We analyzed anti-Cytomegalovirus (CMV) IgG and IgM antibody (EIA) and anti-Epstein-Barr virus (EBV) viral capsid antigen (VCA) IgG and IgM antibody (FA) in adults during 1994-1999. We examined these IgM sero-positive patient's medical records, and diagnosed CMV mononucleosis and EBV mononucleosis. Anti-CMV antibody positive rates decreased from 87.6% in 1994 to 77.8% in 1999. Especially in twenties, anti-CMV antibody positive rates decreased from 65.2% in 1994 to 53.3% in 1999. On the other hand, anti-EBV VCA antibody positive rates were not changed (91-94%). Number of cases of CMV mononucleosis increased from 2 cases in 1994 to 16 cases in 1999, but EBV mononucleosis was not changed. These results suggested that increasing cases of CMV mononucleosis was influenced by decreasing anti-CMV antibody positive rate.