1. de Souza VA; Sumita LM; Otsubo ME; Takei K; Pannuti CS. Enzyme linked immunosorbent assay for rubella antibodies: a simple method of antigen production. A preliminary report. Rev Inst Med Trop Sao Paulo 1995; 37(4):357-9.2. Matter L; Germann D; Bally F; Schopfer K. Age-stratified seroprevalence of Rubella, mumps and rubella (MMR) virus infections in Switzerland after the introduction of MMR mass vaccination. Eur J Epidemiol 1997;13(1):61-6.3. M¨uhlebach-Sponer M; Zbinden R; da Silva VA; Gnehm HE. Intrathecal rubella antibodies in an adolescent with Guillain-Barr´e syndrome after mumps-Rubella-rubella vaccination [letter]. Eur J Pediatr 1995; 154(2):166.4. Johnson CE; Kumar ML; Whitwell JK; Staehle BO; Rome LP; Dinakar C; Hurni W; Nalin DR. Antibody persistence after primary Rubella-mumps-rubella vaccine and response to a second dose given at four to six vs. eleven to thirteen years. Pediatr Infect Dis J 1996;15(8):687-92.5. Matter L; Kogelschatz K; Germann D. Serum levels of rubella virus antibodies indicating immunity: response to vaccination of subjects with low or undetectable antibody concentrations. J Infect Dis 1997; 175(4):749-55.6. Bos P; Steele D; Alexander J. Prevalence of antibodies to rubella, herpes simplex 2 and cytomegalovirus in pregnant women and in neonates at Ga-Rankuwa. Cent Afr J Med 1995;41(1):14-7.