The situation of poliomyelitis in the city of São Paulo is analysed by means of an epidemiologic surveillance parameter – the “r” factor of immunization events. The results of a recent sero-epidemiologic survey realized in this City were transformed into the catalytic growth curve y = a + (1 – a) (1 – e-rt). The informative value of the survey is therefore considerably enhanced. The analysis showed that about 50% and 60% of the population of children 0-10 years old […]