【摘要】 <正> 内蒙东部有一些旗县是牛羊胰阔盘吸虫[Eurytrema pancreaticum(Janson,1889)Looss,1907]流行区。为了要了解科右前旗本吸虫病流行情况,我们于1980—1982年中二个夏天在那里进行了流行病学调查。此外,还应用南方的腔阔盘吸虫[E.coelomaticum(Giard et Billet,1892)Looss,1907]幼虫期在内蒙进行昆虫宿主及牛、绵羊、家兔、豚鼠等实验动物的感染试验。现将调查及试验结果简述于后。更多还原

【Abstract】 The present communication reports our investigations on the epidemiology of E. pancreaticum in sheep in Keerxin-youiqiangi District. The land snail, Ganesella virgo, and the meadow grasshopper, Conocephalus chintnsis collected from infected pastures were examined and proved to be the intermediate hosts of this fluke. The incidences of infection of G. virgo are 0.53-3.3%, averaging 1.35% (207/14629) from different pastures. The incidences of infection of C. chinensis are 4.05-8.16%, averaging 4.58% (11/ 240). In eastern Nei Mongol the expelling of mature sporocysts by molluscan host takes place only from early July to the end of August. So C. chinensis containing mature me-tacercarial cysts are only found present from mid-August to mid-October, and mostly in September.Grasshoppers of two kinds collected from uninfected pastures in Nei Mongol were fed with the mature sporocysts of E. coclomaticum expelled from the land snails, Brady-baena similaris collected from the endemic area of E. coelomaticum in Pujian. The mature metacercariae were discovered from C. chinensis in 28 days after infection. .Some experimental animals including one cattle, five sheep, one rabbit, one Guinea pig and one white rat were fed with G. chinensis or C. maculatus, each having been fed with one mature sporocyst of E. coelomaticnm 30-40 days beforehand, 122-158 days after infection, the specimens of E. coelomcuticum were only found from the experimental cattle and sheep. The specimens secured from cattle are larger than those from sheep.In order to test the antagonism between previously infected E. pancreaticum and the newly introduced E. coelomaticum an experiment was performed. Three sheep which had beed naturally infected for E. pancreaticum were fed with 1261 mature metacerca-riae of E. coelomaticum or 18 C. maeulatus, each being fed with one mature sporoeyst of E. coelomaticum 30 days beforehand. These sheep were dissected 29-160 days after infection, 504, 130 and 91 adults of E. pancreaticum and 486, 502 juveniles and 1263 adult specimens of E. coelomaticum were found from the pancreatic, ducts of each of the three sheep.更多还原