Volume 43, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A longitudinal entomological survey of the vectors of loiasis was conducted in the Missama area (Lekoumou region) in the Congo from September 1987 to August 1989. The principal catching site was a palm grove surrounded by forest 3 km from the village. Landing/biting densities of were measured by standardized fly catches lasting 11 hr carried out twice a month. Vector landing densities were also assessed in the Bantu and Pygmy villages and in the fields. Populations of from the palm grove were examined 6 times a month for infection with the infective stage of was the predominate vector except at the beginning of the rainy season, when was the prevailing species. were caught throughout rainy season, from October to June. The host-seeking activity of was greatest in the middle of this season (February), but occurred sooner (October) for . The following variables associated with transmission were calculated from our observations in the palm grove (the first figure corresponds to the first year of the study and the figure in parentheses corresponds to the second year). It was calculated that 2.658 (2.185) and 1.412 (1.182) could bite a person in the palm grove per year, including an average of 14.4 (12.7) infective and 9.8 (7.2) infective . The percentage of all dissected flies with third stage larvae in the head and the mean number of larvae in the head/infective fly were 0.57% and 10.1 ± 6.8 for and 0.66% and 11.2 ± 6.5 for , respectively. The estimated annual transmission potentials were 171.1 (102.9) for and 116.1 (73.8) for . In the palm grove, transmission was ensured by 2 effective vectors during the rainy season (October to May). Although the annual biting rate for both species was twice as low in the village as in the forest, our data suggest that effective transmission occurs there also.


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