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Isolation and some characteristics of an agent associated with inclusion body hepatitis, hemorrhages, and aplastic anemia in chickens.

An agent was isolated from chickens with lesions of inclusion body hepatitis, anemia, and intramuscular hemorrhages when a liver suspension was inoculated via yolk sac into specific-pathogen-free (SPF) 4-day-old chicken embryos. Embryos died, generally within 5 to 10 days postinoculation (PI) when given inoculum from subsequent passages. Harvested infective yolk material proved negative for other known or described avian pathogens and passed through a 0.22-/ Millipore filter. Infectivity trials were conducted with chickens of different ages and sources in reproducing the disease syndrome. Parental immunity to the agent interfered in inducing the disease experimentally. Transmission of the agent from dam to progeny was suggested as occurring in 3 experiments. Attempts at characterization of the agent indicate that the disease is virus-caused. It is recommended that the new agent be designated inclusion body hepatitis virus (IBHV).