RESUMO
Biomedical studies accompanied by a questionnaire survey were carried out on 803 pupils of classes 3; 5 an 7 attending 17 primary schools in the Kumba Health District to determine the prevalence of soil - transmitted nematodes and infection-associated morbidity. The prevalence rate of worms in the sample population from the questionnaire survey was 42.3which correlates closely with 44.2recorded for abdominal pains. The biomedical studies gave a worm infection rate of 67.1. Ascaris lumbricoides; Trichuris trichiura and hookworm had prevalence rates of 54.9; 33.8and 20.3respectively. Mixed infections were recorded in 34.4of the sample population compared to 32.8for single infections. Hookworm infection rate was significantly higher in the rural areas than in the urban areas (27.5versus 14.8; P 0.001). A similar trend was observed for T. trichiura (38.4versus 30.3; P 0.02). Prevalence of A. lumbricoides was similar in the urban and rural areas (56.5versus 52.6). Males carried heavier burdens of Ascaris and Trichuris than females. The worm burden for all 3 species decreased as children moved to higher classes and with age after the first decade of life. There was a significant correlation between the intensities of infection of A. lumbricoides and T. trichiura