RESUMO
Diagnosis of Histomoniasis. Case-report. Eighty turkeys [2-3 months old] from a small flock in Mashhad area. In February 2003, in a small flock of turkeys [n=80] that co-bred with domestic hens [n=200] and geese [n=70] a disease occurred with clinical signs of inappetence, diarrhea and head cyanosis. Disease had high morbidity [75%] and mortality [66%]. Five carcases and two ill turkeys were refreed to birds clinic for diagnosis and tretment of disease. At necropsy, congestion and necrosis in mucosa of ceca and liver were characterized. Because of strong suspicion to histomoniasis, tissue samples were obtained for Parasitological and Pathological examinations. After preparing smears and tissue sections, they were stained with Giemsa and Haematoxyline-Eosine methods, respectively. Also, faeces of domestic hens were examined for determination Heterakis gallinarum infestation. Microscopical examination of the smears and tissue sections were shown Histomonas melagridis infection in cecum and liver. Also the hetrakid or ascarid eggs were found in the faeces. The results of this study indicates that histomoniasis can be an important disease of turkeys in Iran when co-bred with chicken