Abstract
Seven 18-wk-old pullets from a commercial layer flock experiencing increased mortality associated with neurologic and respiratory symptoms were submitted to the California Veterinary Diagnostic Laboratory System at the Turlock Branch for necropsy. Clinical signs included depression, torticollis, swollen eyelids, conjunctivitis, and sinusitis. Meningoencephalitis and suppurative inflammation of the cranial air spaces were found on histopathology. The brain, sinuses, and air spaces of the cranium were infected with Pasteurella multocida. Complicating the condition was Mycoplasma gallisepticum infecting the sinus and paramyxovirus-I affecting the trachea.
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