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作者将8只羊分成甲、乙二组,每组4只。甲组4只羊早在一年前接种过2万条曼氏血吸虫尾蚴,不再排出虫卵。为了加强免疫反应,再以曼氏血吸虫尾蚴1万条作免疫接种,于接种后13周,与乙组(对照组)同时接种1万条梅氏血吸虫尾蚴。在感染后9周解剖时发现甲组羊较乙组羊的虫为少,减虫率分别为42.6、2.8、9.3及11.4%。梅氏雌虫的平均长度乙组分别为18.6、18.7、18.7及18.8毫米,甲组分别为14.7、15.1、15.9及16.1毫米。最突出的差异在于甲组组织虫卵
The author divides 8 sheep into A and B groups, 4 in each group. A group of four sheep as early as a year ago inoculated with 20,000 mansoni Schistosome cercariae, no discharge of eggs. In order to strengthen the immune response, and then to Schistosoma mansoni 10000 cercariae for immunization, 13 weeks after inoculation, and group B (control group) at the same time inoculation of 10,000 Mechstris Schisandrae. At 9 weeks after infection, the females in group A were found to have less worms than those in group B. The worm reduction rates were 42.6, 2.8, 9.3 and 11.4% respectively. The average length of the Meyer’s females was 18.6, 18.7, 18.7 and 18.8 mm in Group B, and 14.7, 15.1, 15.9 and 16.1 mm in Group A respectively. The most prominent difference is that group A tissue eggs