| isolation of apparently wild strains of poliovirus type 1 from sewage in the ottawa area. | in the first 4 months of 1974, 140 gauze pad samples of sewage collected in the ottawa area were analysed by the bs-c-1 cell system for the presence of viruses pathogenic for humans. viruses were isolated from 111 (79%) of the samples. of the 72 (65%) isolates identified by serology and electron microscopic examination, 56 (78%) were reoviruses and 16 (22%), enteroviruses. the enterovirus isolates included one coxsackievirus b4, one vaccine strain of poliovirus type 3, nine vaccine strains of po ... | 1977 | 188533 |