Age and sex differences in new and recurrent cases of guinea worm disease in Nigeria.

In this population-based cross-sectional survey of the prevalence and incidence of guinea worm disease in Idere, a rural agricultural community of Oyo state in Nigeria, epidemiological data were collected by household interview of all 501 households (6527 persons, 3594 females and 2933 males). 86% of the households had at least one case. The prevalence was 32.4% in the overall population, but varied markedly by age and sex. About 10% of prevalent cases were first-time infections or new cases. Males over 19 years of age had a higher prevalence rate than adult females; however, females had a higher prevalence rate at younger ages. The prevalence in females peaked (47%) at 35 to 44 years; for males the proportion was highest (57%) at ages 45 to 54 years.