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(A) The re-isolation rate of the vaccine strain from the positive cloacal swabs in both the only vaccinated group and the vaccinated + SP group throughout the whole experiment. (B) The bacterial loads of S. Pullorum in spleen, liver, ovary, and oviduct on 21 d postchallenge. The effect of the S. Enteritidis vaccine on the heart/body weight ratio (C), liver/body weight ratio (D) and spleen /body weight ratio (E) on 21 d postchallenge.
