Protective efficacy of a locally prepared bivalent duck viral hepatitis “serotypes 1 and 3” inactivated vaccine by Dalia M. Omar, Mohamed A. Abdrabo, Nermin M. Monir, Nermeen A. Marden, Heba M.G. Abdelaziz, Walaa A. ElSayed, Nahed Yehia, Sabry E. Omar, Ahmed M. Erfan, Abdel-Satar Arafa, Momtaz A. Shahein, Lamiaa M. Omar

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