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Inactivated FA4-F8b induced efficient neutralizing antibodies against both FAdV-4 and FAdV-8b. The neutralizing activity (NT) of sera against FAdV-8b (A), FAdV-8a (B), and FAdV-4 (C) from the inoculated chickens were tested at 7, 14, 21 and 28 dpv, and then these chickens at 28 dpv were infected with FAdV-8b, FAdV-8a and FAdV-4 at 28 dpv, respectively.
