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Abstract

Avian mycoplasmosis consider one of the main poultry industry problems all over the world. The present short communication records the pathological lesions in Mycoplasma synoviae (MS) positive samples. Our study was applied to joint tissue samples collected from chicken suspected of mycoplasma infections during a previous study. Joint tissue samples positive MS infection; from broiler breeder flocks aging 46-57 weeks with clinical arthritis were fixed in 10% neutral buffered formalin. Histopathological examined sections from MS positive joint samples showed detachment of the synovial sheet, moderate to severe tendonitis with moderate intensive inflammatory cells infiltration. Infiltration in/and around the blood vessels with lymphocytes of the synovial sheet. Few cases showed mild inflammation in tendon sheet characterized by inflammatory cells infiltration. In was concluded from the study that te detection of histopathological changes can be of value in diagnosis of MS natural infection in chicken with clinical arthritis but not sufficient alone. Although, histopathological examination is an auxiliary diagnostic tool besides isolation and molecular identification techniques.