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牛乳源性无乳链球菌表面蛋白sip及pgk对奶牛的免疫保护试验
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摘要
目的评价牛乳腺炎无乳链球菌表面亚单位抗原SIP、PGK对奶牛的免疫保护性。方法通过制备SIP、PGK、SIP+PGK三种亚单位抗原乳化免疫制剂,分别对科尔沁奶牛进行免疫试验,检测免疫0d、14d、28d、42d、56d、70d、84d的血清抗体滴度,同时设立牛乳腺炎无乳链球菌全菌体裂解免疫制剂免疫组作为对照。在三免后14d利用10×105 CFU/m L的无乳链球菌临床分离株进行乳头感染试验,同时设立非免疫牛对照组。通过感染抑制率统计出免疫保护效果。结果免疫后结果表明SIP、PGK单一抗原免疫后第14d、28d、42d、56d、70d、84d的血清抗体平均滴度分别为1:1200、1:2800、1:4600、1:6600、1:5200、1:4000和1:1000、1:2700、1:4500、1:6400、1:5300、1:3500;全菌体裂解抗原免疫组抗体平均滴度为1:800、1:1600、1:3400、1:4100、1:3400、1:2800;混合抗原免疫后其抗体滴度平均为1:1400、1:3600、1:5400、1:7800、1:9600、1:6000。免疫保护试验结果显示,SIP+PGK混合抗原的免疫保护率达到83.3%,而SIP、PGK抗原及全菌体裂解抗原单独免疫组的免疫保护率分别为33.3%、41.6%、58.3%。结论牛乳腺炎无乳链球菌表面蛋白SIP+PGK混合抗原的免疫保护率优于该两种抗原的单独免疫效果,差异显著(p<0.05),可以对奶牛进行临床免疫来预防无乳链球菌性乳腺炎。
diary mastitis streptococcus agalactiae.Methods The three kind of emulsity immunity agents were prepared and were tested for protective immunity to diary cattle.The antibody titer of sera for immunized at 0d,14 d,28 d,42 d,56 d,70 d and 84 d were determined.The group of immunized with whole cell lysitive antigen was asthe control group.Result The result showed that the sera antibody titer of SIP and PGK single antigen after immune 14 d,28 d,42 d,56 d,70 d,84 d were 1:1200,1:2800,1:4600,1:6600,1:5200,1:4000;1:1000,1:2700,1:4500、1:6400、1:5300、1:3500,respectively.The sera antibody titer of the whole cell lysis immunity antigen were1:800、1:1600、1:3400、1:4100、1:3400、1:2800.And the sera antibody titer of SIP+PGK mixed antigen were1:1400、1:3600、1:5400、1:7800、1:9600、1:6000.The immunity protective assay result showed that the protective rate was 83.3% of the SIP+PGK mixed antigens,and the protective rate of SIP,PGK antigen and whole cell lysis antigen were 33.3%,41.6% and 58.3%,respectively.Conclusion The immunity protective rate of SIP+PGK fusion antigens were better than the immunity protective rate of the two antigens were immuned with respectively.The effect was difference(p<0.05).They were could be used to prevention of dairy cow mastitis.
引文
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