Abstract
Turkey rhinotracheitis (TRT) virus was first isolated from a commercial broiler chicken with swollen head syndrome (SHS) in Japan. At the same time, Newcastle disease virus (NDV), infectious bronchitis virus (IBV), avian reovirus (ARV), Escherichia coli (E.coli), Morganella morganii, and Proteus mirabilis were also isolated from the same broiler chicken. The presence of antibodies to TRT virus was confirmed in the sera of 34-day-old chickens of the flock with SHS, however the antibodies to TRT virus were undetectable in the sera of 17-day-old chickens. In this investigation, we confirmed avian pneumovirus infection in chickens in Japan, and the virus and other agents may be considered as a cause of SHS.
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