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Journal of Entomology and Zoology Studies
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P-ISSN: 2349-6800, E-ISSN: 2320-7078

Journal of Entomology and Zoology Studies

2022, Vol. 10, Issue 1
Evaluation of some parameters involved in onchocerciasis transmission in the DJOUE fireplace in Brazzaville

LAPY MATHAH Sabine Esther, LENGA Arsène, BITSINDOU Patrick and MISSAMOU François

The evaluation of some entomological parameters of onchocerciasis transmission was carried out in the Djoué focus, south of Brazzaville, from July to December 2018. The entomological parameters evaluated were the density of bites of black flies, the parturition rate and the infestation rate.
Three sites were investigated, namely the enclosure of the WHO/AFRO office, the surroundings of the Djoué hydroelectric dam, and the bridge’s surroundings over the Djoué. The results obtained indicate that the density of bites is on average 855 bites/man/day in the dry season against 560 bites/man/day in the rainy season. The most prolific site is the one located within the WHO/AFRO enclosure, with 1136 bites/man/day in the dry season and 721 bites/man/day in the rainy season. The parturity rate is on average 58.45% in the dry season, and 59.59% on average in the rainy season. The infestation rate was on average 1.4% in the dry season against 0.7% in the rainy season. The black flies from the WHO/AFRO site had the highest infestation rate with 1.6% in the dry season compared to 0.9% in the rainy season. The aggressiveness expressed by the black flies’ capture density indicates that August and September had the highest densities. Thus, 913 bites/man/day were obtained. Regarding the parturity rate, it appeared more important in September with 67.9%. The percentage of infestation was higher in July with 31 L3 stage larvae.
These results confirm the presence of onchocerciasis in the city of Brazzaville and the designated WHO/AFRO site appears to be the most infested site. In addition, these results show that it is important to carry out regular entomological evaluations coupled with a verification of the effectiveness of the treatments initiated with Ivermectin under the Community Directive (CDTI).
Pages : 55-62 | 513 Views | 114 Downloads


Journal of Entomology and Zoology Studies Journal of Entomology and Zoology Studies
How to cite this article:
LAPY MATHAH Sabine Esther, LENGA Arsène, BITSINDOU Patrick, MISSAMOU François. Evaluation of some parameters involved in onchocerciasis transmission in the DJOUE fireplace in Brazzaville. J Entomol Zool Stud 2022;10(1):55-62. DOI: 10.22271/j.ento.2022.v10.i1a.8924

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