| filariasis in the igwun river basin, nigeria: an epidemiological and clinical study with a note on the vectors. | in a cross-sectional, epidemiological and parasitological study of human filariasis, 845 individuals were examined in settlements along the igwun basin, imo state, nigeria. four different filarial nematode species were identified. two hundred and fifty-six (30.3%) of the individuals examined were positive for onchocerca volvulus, 113 (13.4%) for mansonella perstans, 76 (9.6%) for wuchereria bancrofti and 77 (9.1%) for loa loa. microfilarial rates increased with age of individuals and showed a te ... | 1988 | 3041931 |