Year: 2026
Type: article
Abstract: Rising groundwater occurring in Niamey city, leads to the formation of waterholes facilitating the proliferation of mosquitoes which are responsible of numerous vector-borne diseases including malaria, transmitted by Anopheles species. This study aims to determine how this phenomenon influence the risk of exposure to malaria. Doing so, we carried out over a nine-month period, an entomological monitoring in 3 different areas of Niamey city: 2 of them were permanently flooded, while the third one, never flooded serves as a control. Mosquitoes were collected using CDC light traps and insecticide sprays throughout 72 sampling locations across all the areas. Specimens were identified using a morphological identification key. Species abundances and entomological parameters were analyzed using R software (v.4.4.0) and compared using a chi-square test. A total of 1,071 specimens of Anopheles gambiae complex were collected, including 43.79% females. Abundances were found higher: i) in flooded sites: 56.21% and 25.68% respectively, while it was only about 7% at the non-flooded (p <0.001); ii) during the rainy season (85.8%) but, tends to decrease during the dry seasons (cold: 13.91% and hot: 0.28%; p <0.001). Females were more abundant in flooded sites, up to 54.16% and Human-Blood Index, varied from 34.1% to 20% between sites and from 41.7% to 29.9% between seasons (p <0.001). Besides being low (0.83%), the overall infectivity rate, was limited to the flooded sites and only during the rainy season. These insights could serve malaria prevention strategies by focusing on mosquito control in high-risk areas and periods.
Author: Ibrahim Danzabarma Abdoulaziz
Institution: Université Abdou Moumouni
Language: English
Topic: Malaria Research and Control
Field: Medicine
Domain: Health Sciences
Open Access status: bronze
OpenAlex ID: W7166345833