During the process of immunization it was found that-the complement-fixation reaction zone of the serum of the immunized horses was the same as that of the serum of the naturally infected horses.
在免疫过程中免疫血清和抗原与自然鼻疽患马血清和抗原呈现相同之反应域，抗原滴度不因血清不同而有所变动。
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