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All chickens' bursa Fabricius and spleen were weighed on day 5, 10, 15, 25, 35 postvaccination. 分别于注苗后5、10、15、25、35d，每组随机取10只鸡称重，并取免疫器官脾、法氏囊用10%25福尔马林固定后称重，作统计学处理。