This study was conducted to determine the incidence of Trichomoniasis in Columba livia , One hundred out of two hundred and fifty suspected pigeons were revealed clinical signs and lesion has been checked , the lesions included inflamed ulcerated white to yellow masses ulceration in the ulcerated oral cavities and/or gastrointestinal tracts of the affected pigeons. As well as showing a characteristic oscillatory movement of the parasite due to the movement of the front flagellum and the undulating membrane. Histological examination showed the presence of ulcers in the oral cavity, while in the tongue, histological examinations showed the presence of acanthus degeneration and severe infiltration of inflammatory cells, while in the gizzards, there was a separation between the skin of the stomach and the mucous membrane and atrophy of the simple tubular glands. In the liver, it showed hepatocyte dysfunction and hepatocyte necrosis in the focal region
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