Zahed N Z, Ghandour A M, Banaja A A, Banerjee R K, Dehlawi M S
Department of Biological Science, Faculty of Science, King Abdul Aziz University, Jeddah, Saudi Arabia.
Trop Med Int Health. 1996 Aug;1(4):449-55. doi: 10.1046/j.1365-3156.1996.d01-100.x.
Free ranging hamadryas baboons (Papio hamadryas) in four localities in the west and north of Saudi Arabia were examined for natural infection with Schistosoma mansoni. Faecal examination revealed infection with S. mansoni on four occasions within one year (at a prevalence rate of 2.5-4.0%) in only one locality, the Al-Baha area. The eggs were viable, as shown by miracidial hatching tests, and were recorded at a density of 140-280 eggs/g of faeces (7000-14,000 eggs/day). Post-mortem examination of 13-24 baboons from each locality revealed infection with S. mansoni (adult worms and eggs in tissue) in only one locality, the Al-Baha area, at a prevalence rate of 4.16%. Viable eggs were found in the faeces and tissue of the infected baboons. The low prevalence rate of S. mansoni in hamadryas baboons in Saudi Arabia is in accordance with the low prevalence rate of S. mansoni in humans in the area. This natural baboon isolate was highly infective to snail intermediate hosts and mammalian hosts under experimental conditions. The epidemiological significance of the role of P. hamadryas (considering their large overall population of 250,000) as maintenance hosts of S. mansoni in Saudi Arabia is discussed.
对沙特阿拉伯西部和北部四个地区的野生阿拉伯狒狒（Papio hamadryas）进行了曼氏血吸虫自然感染情况检查。粪便检查显示，仅在一个地区即巴哈地区，一年内有四次检测到曼氏血吸虫感染（患病率为2.5%-4.0%）。通过毛蚴孵化试验表明，虫卵具有活力，粪便中虫卵密度为140-280个/克粪便（7000-14000个/天）。对每个地区的13-24只狒狒进行尸检发现，只有巴哈地区的狒狒感染了曼氏血吸虫（组织中有成虫和虫卵），患病率为4.16%。在受感染狒狒的粪便和组织中发现了有活力的虫卵。沙特阿拉伯阿拉伯狒狒中曼氏血吸虫的低患病率与该地区人类中曼氏血吸虫的低患病率一致。在实验条件下，这种来自狒狒的自然分离株对蜗牛中间宿主和哺乳动物宿主具有高度传染性。文中讨论了阿拉伯狒狒（考虑到其总数达25万只）作为沙特阿拉伯曼氏血吸虫保虫宿主的流行病学意义。
