humoral and cell-mediated immunity to rubella virus after naturally acquired infection were compared in 19 cloistered nuns ( 29-79 years of age ) , 18 female schoolteachers ( 21-61 years of age ) , and 21 female control subjects ( 20-30 years of age ) , who were all seropositive for rubella virus , by use of a hemagglutination-inhibition test , a passive hemagglutination test , a hemolysis-in-gel test , a radioimmunoassay , an enzyme-linked immunosorbent assay , and lymphocyte transformation tests .
C0009450
infection
C0035924
rubella virus