Three hundreds and twelve sequelae of paralytic poliomyelitis were diagnosed among 163,013 lame children under 12 years of age. The prevalence of paralytic poliomyelitis was 1.91%. The result showed that although the morbidity of poliomyelitis has greatly decreased since the programme on immunization against polio were introduced, there were still a number of unreported cases. Of the cases diagnosed, ninety-three per cent were those who were unvaccinated and were mostly infected in the first four years of life.