The problem of poliomyelitis in the county of São Paulo, Brazil, was studied from 1933 to 1967. It emphasizes the period of 1962 to 1967, when the author analizes the relation between the variation in the incidence of the disease and the mass vaccination campaigns with the live virus vaccine attenuated accomplished at that time. Based on the data presented he concludes that in 1967, when the morbidity rate by poliomyelitis was 0.6 for 100,000 inhabitantes, it was possible to get the control of that disease in the county of São Paulo.
