Salivary antibody detection in epidemiological surveys: a pilot study after a mass vaccination campaign against rubella in sao paulo, brazil - Azevedo Neto, Raymundo Soares de; Richards, A; Nokes, D J; Silveira, A S B; Cohen, B J; Passos, S D; Souza, Vanda Akico Ueda Fick de; Brown, D W G; Pannuti, Cláudio Sérgio; Massad, Eduardo (Transactions of the Royal Society of Tropical Medicine and Hygiene, 1995)