Moustapha Lamine M, Sanda Abdoul-Nasser H, Mukhtar Muhammad M, Muhammad Abdullahi, Einoi Hadizat K, Aliyu Yusuf Y, Adamu Shuaibu, Moudalabi Tidjani M, Lawali Ibrahim Y, Moussa Al-Hadji D, Soumaila Hadiza, Adehossi Eric, Ibrahim Maman L, Doutchi Mahamadou, Ibrahim Sulaiman S
Lab-EGB2S, Department of Biological Sciences, Université André Salifou, KM 5 Route d'Agadez, PMB 656, Zinder, Niger.
Centre de Formation et de Recherche en Médecine Tropicale/UAM, Rive droite, PMB 10 896, Niamey, Niger.
Sci Rep. 2025 Jul 2;15(1):22647. doi: 10.1038/s41598-025-07389-5.
Anopheles stephensi, an invasive vector is aggressively expanding its geographic range across Africa, posing significant threat to malaria control. Surveillance of its spread is crucial for mitigating its impact on malaria transmission. Here, we report for the first time incursion of An. stephensi into Gayi, a rural area in southern Niger Republic. A combination of morphological identification, end point PCR and sequencing of fragments of COXI and ITS2 genes confirmed An. stephensi. This species was found resting indoor together with other mosquitoes, including An. coluzzii, An. gambiae s.s., and An. arabiensis. Entomological parameters, including resting densities, human blood index and biting rate, Plasmodium falciparum parasite rate, and entomological inoculation rate were described for the above Anopheles species. The finding of An. stephensi sympatric with the above major malaria vectors in Niger highlights the urgent need for intensified surveillance to develop evidence-based approaches to prevent further spread of this pervasive vector.
斯氏按蚊是一种入侵性病媒，正在非洲积极扩大其地理分布范围，对疟疾防控构成重大威胁。监测其传播对于减轻其对疟疾传播的影响至关重要。在此，我们首次报告斯氏按蚊侵入了尼日尔共和国南部的一个农村地区加伊。通过形态学鉴定、终点PCR以及对COXI和ITS2基因片段进行测序相结合的方法，确认了斯氏按蚊。该物种被发现与包括科氏按蚊、冈比亚按蚊指名亚种和阿拉伯按蚊在内的其他蚊子一起在室内栖息。描述了上述按蚊种类的昆虫学参数，包括栖息密度、人血指数和叮咬率、恶性疟原虫寄生虫率以及昆虫学接种率。斯氏按蚊与尼日尔上述主要疟疾传播媒介同域分布这一发现凸显了加强监测的迫切需求，以便制定基于证据的方法来防止这种普遍存在的病媒进一步传播。
