MONITORING POSITIVITY FOR Schistosoma mansoni IN RODENTS Holochilus sp. NATURALLY INFECTED

AbstractThe occurrence of non-human mammals such as schistosomiasis reservoir has always been an aggravating factor to be studied. Family cricetidae rodents like Nectomys sp, seem to have an important role in the potentiation of the spread of it. However, for Holochilus sp. (Rodentia: Cricetidae), found in Maranhão, studies with this function seem scarce. Thereby, we aimmed to analyze the infection rate of these animals for S. mansoni in São Bento - MA, endemic area for the parasite. These rodents were monitored during 12 months, by the Tomahawk traps for caught and triplicates of stool tests blades, made by Kato-Katz kit, for parasitogical exam. A total of 101 rodents were captured, of which 28.7% were naturally infected by S. mansoni (17.3% females and 82.7% males). This analysis showed that an average of 2.4 rodents was infected for one year, being possible to find positive animals in almost all the collects. Therefore, the rodent Holochilus sp. is a potential candidate in ensuring the maintenance of the schistosomiasis cycle in the region under study.

摘要：血吸虫病（schistosomiasis）保虫宿主类的非人类哺乳动物的存在，始终是亟待深入研究的加剧该病传播的重要因素。以奈斯稻鼠属（Nectomys sp.）为代表的仓鼠科（Cricetidae）啮齿动物，似乎在该病的传播增强过程中发挥了关键作用。然而，针对在巴西马拉尼昂州（Maranhão）发现的稻水鼠属（Holochilus sp.，啮齿目：仓鼠科）开展的此类功能相关研究却较为匮乏。为此，本研究旨在分析该寄生虫的流行疫区——马腊尼昂州圣本图市——内上述啮齿动物的曼氏血吸虫（S. mansoni）感染率。研究通过汤姆霍克捕鼠器（Tomahawk traps）开展了为期12个月的野外捕获监测，并采用加藤-凯特茨试剂盒（Kato-Katz kit）制备三份粪便涂片标本以开展寄生虫学检查。本次研究共捕获啮齿动物101只，其中28.7%的个体自然感染曼氏血吸虫，雌性与雄性感染占比分别为17.3%与82.7%。分析结果显示，年均每2.4只啮齿动物即存在1例感染病例，且几乎所有采样批次均可检出阳性动物。综上，稻水鼠属（Holochilus sp.）是维持本次研究区域内血吸虫病传播循环的潜在关键宿主。