2003, 20(2):7-7.
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2003, 20(2):9-10.
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2003, 20(2):23-24.
摘要:A very virulent strain(J 20)of infectious bursal disease virus was isolated in a chicken farm in Jilin Province by using SPF chickens and SPF chick embryoes. The isolate was unable to agglutinate chicken red blood cells and IBDV antigen was detected in the isolate with refereuce IBDV serum. The viral titer(EID50)reached 106/0.2mL,with an incidence of 100% and a mortality of upto 70%.The IBDV-J20 was confirmed as a very virulent strain of IBDV by regression test with the isolate J20,physical and chemical analysis and electron microscopic observation.
2003, 20(2):25-27.
摘要:Summary: Brucella abortus international standard reference serum was used for calibrating the test results of complement fixation test (CFT), enzyme linked immuno-sorbent assay (ELISA), Rose Bengal precipitation test (RBPT), slow agglutinating test (SAT) and for setting cut-off point. 42 positive and negative brucella sera samples were also tested by the four methods and the results were converted by standard coefficient. Kappa values between four serological methods were calculated by converting coefficient. The study showed the way for comparison of the test results in different laboratories and methods by standard serum.
2003, 20(2):41-43.
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