家鸭具有作为血吸虫转运宿主的可能性

为研究日本血吸虫(Shistosomia japonicum)卵通过家鸭消化系统后的孵化能力,将人工感染血吸虫尾蚴45 d的小鼠剖杀,取肝脏和小肠制成匀浆,并进行虫卵计数,将带有虫卵的肝脏及小肠匀浆液分别灌喂家鸭,观测不同时间收集鸭粪的毛蚴孵出情况。结果显示,经过家鸭体内2 h后,粪便中孵化率达到峰值,相对孵化率分别为0.61%和4.066%;7 h后,没有虫卵能孵化出毛蚴。同一批次的虫卵所孵化的毛蚴中,大约经过4 h后其孵化率达到峰值。结果表明,日本血吸虫虫卵通过家鸭消化系统后仍有部分依然保持孵化能力,家鸭具有可能作为血吸虫的转运宿主,拥有传播血吸虫有效虫卵的能力。

STUDY ON THE POSSIBILITY OF DUCK AS TRANSPORT HOSTS FOR SCHISTOSOMA JAPONICUM

To study the hatchability of Schistosomia japonicum eggs in duck digestive system,mice were infected with S.japonicum cercarias and sacrificed 45 days later.The liver or intestine homogenates containing eggs were fed to ducks.Duck faeces were collected to examine the hatchability of eggs using miracidia hatching technique.Viable eggs were recovered from all ducks although the hatchability significantly declined after the passage through ducks.The hatching peak reached at 2 hours post ingestion.The relative hatchability rates were 0.61% and 4.066% for liver or intestine homogenates.No miracidia were found at 7 hours after ingestion.The hatch rate reached its peak after approximately 4 hours’ hatching although some miracidia were found at 12 hours.The eggs recovered from duck faeces maintained hatchability,which suggested that ducks might play a role in transmission of S.japonicum.