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The course of parasitemia and development of specific antibodies in dogs inoculated with babesia gibsoni


, : The course of parasitemia and development of specific antibodies in dogs inoculated with babesia gibsoni. Japanese Journal of Bacteriology 38(4): 687-694

Live and killed anitgens of B. gibsoni were prepared for serological and immunological studies. The serum-antibody titers of the dogs infected with B. gibsoni and immunized with killed B. gibsoni were determined by the indirect fluorescent antibody (IFA) test. Of the 14 dogs experimentally infected with B. gibsoni, 10 survived and showed significant increase in the IFA titer to B. gibsoni (1:3,200 in 3 to 4 weeks and 1:12,800 in 2 mo. after the infection). The other 4 dogs died of babesiosis showing little increase in the IFA titer (1:80 .apprx. 1:800 in 3 weeks after infection). When live B. gibsoni was reinoculated into 2 dogs having survived the infection with IFA titers of 1:12,800, no erythroparasitemia was observed and B. gibsoni disappeared in 2 wk after the reinoculation. The IFA titers of over 1:12,800 persisted during the observation period. Such a high IFA titer may prevent the dogs from infection with B. gibsoni. Four healthy dogs were immunized twice with killed B. gibsoni at a 3 wk interval, and then challenged with live B. gibsoni in 3 wk after the second immunization. It took 2 wk for the IFA titer to increase gradually after the first immunization and titers of 1:400 .apprx. 1:800 were maintained after the second immunization. All of them survived the challenge and the IFA titers rapidly increased to 1:12,800. Parasitemia on a low level was observed. The immunization with killed B. gibsoni antigen protected the dogs against babesiosis (erythroparasitemia, splenomegaly) in comparison with the nonimmunized group.

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