Laboratory of Vector Ecology, Pasteur Institute of Tunis, Tunis 1002, Tunisia.
Laboratory of Clinical Virology, Pasteur Institute of Tunis, Tunis 1002, Tunisia.
Int J Environ Res Public Health. 2021 Sep 2;18(17):9274. doi: 10.3390/ijerph18179274.
Zoonotic cutaneous leishmaniasis (ZCL), endemic in Central and Southern Tunisia, is caused by (Kinetoplastida: Trypanosomatidae), which is transmitted by the sand fly . In Tunisia, the fat sand rat and the desert jird are the principal reservoir hosts of . The presence of the vector of the etiologic agent of ZCL was assessed in the vicinity of villages in endemic areas of Central Tunisia. The study was performed from September through October 2019, a period corresponding to the main peak of activity of . Sand flies were collected from rodent burrows located at the ecotone level, which is the transition zone between the natural environment and human settlement. Sand flies were identified to species level and tested for the presence of by PCR. Our entomological survey showed that is the most abundant sand fly species associated with rodent burrows, and this abundance is even higher in ecotones primarily occupied by in comparison to ecotones occupied by . Infections with were detected only in , with an overall minimum infection rate (MIR) of 2.64%. No significant difference was observed between the MIRs in ecotones of and of . Incidence of ZCL in the studied areas ranged from 200 to 700 cases per 100,000 inhabitants, with a mean incidence of 385.41 per 100,000. Higher ZCL incidence was identified in ecotones of compared to ecotones of . ZCL cases are positively correlated with the MIRs. Considering the short flight range of , increases in its densities associated with burrows of or at the ecotone level expand the overlap of infected vectors with communities and subsequently increase ZCL incidence. Therefore, control measures should target populations at the ecotones.
人兽共患皮肤利什曼病(ZCL)在突尼斯中部和南部流行,由 (Kinetoplastida:Trypanosomatidae)引起,由沙蝇 传播。在突尼斯,肥沙鼠 和沙漠跳鼠 是 的主要储存宿主。评估了 ZCL 病原体传播媒介 在突尼斯中部流行地区村庄附近的存在情况。该研究于 2019 年 9 月至 10 月进行,这一时期与 的主要活动高峰期相对应。从位于生态过渡带(即自然环境与人类住区之间的过渡区)的啮齿动物洞穴中收集沙蝇。将沙蝇鉴定到种水平,并通过 PCR 检测 是否存在 。我们的昆虫学调查显示, 是与啮齿动物洞穴相关的最丰富的沙蝇物种,而在主要由 占据的生态过渡带中,这种丰度甚至高于由 占据的生态过渡带。仅在 中检测到 感染,总体最小感染率(MIR)为 2.64%。在 和 的生态过渡带之间,未观察到 MIR 之间有显著差异。在所研究地区,ZCL 的发病率范围为每 10 万人中有 200 至 700 例,平均发病率为每 10 万人 385.41 例。在 生态过渡带中,ZCL 的发病率高于 在生态过渡带中。ZCL 病例与 MIR 呈正相关。考虑到 的短飞行范围,与 或 在生态过渡带的洞穴相关的密度增加会扩大受感染媒介与社区的重叠范围,从而增加 ZCL 的发病率。因此,控制措施应针对生态过渡带中的 种群。
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