Groups 1,2 and 3 were injected with 1 mL serum preparation,1 mL “shuangkang”(containing penicillin 1 000 unit and streptomycin 1 000 unit per mL) and 1 mL physiological saline respectively.
选用１２日龄蛋公雏９０只，随机分成３组，Ⅰ组每羽肌注鸡血清制剂１ｍＬ；Ⅱ组每羽肌注“双抗”１ｍＬ（含青、链霉素各１０００单位）；Ⅲ组每羽肌注生理盐水１ｍＬ。
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