Unsexed day-old White Leghorn chicks hatched from eggs pre-treated with erythromycin were infected via the yolk sac with a 48-hr broth culture of pathogenic Mycoplasma gallisepticum (S6). Fourteen of the 57 experimental female birds had gross lesions in the oviduct, characterized by the presence of grayish-white caseous plugs of various sizes in a segment or throughout the length of the oviduct. Forty-six of the infected female birds had microscopic lesions, detected primarily as mild heterophilic infiltration, lymphocytic aggregates, lymphoid follicles, diffuse lymphocytic infiltration, pleocellular response, or a combination of any of these depending on the stage and extent of infection. The caseous plugs were formed by tissue debris, fibrin, necrotic heterophils, and sometimes a few lymphocytes and macrophages. Changes that accompanied the necrotic exudate were atrophy of the mucosa, hypertrophy of the oviduct wall, or sometimes necrosis of the folds of mucosa. No significant gross and microscopic lesions were detected in ovaries, although 3 of the 33 infected male chickens had histological lesions in the testes. Gross and microscopic changes of mycoplasmosis were also found in the respiratory tract. M. gallisepticum could be consistently reisolated from oviduct(s) up to five weeks PI; thereafter, isolations were intermittent. From the ovaries or testes the organism could be isolated consistently up to one week PI only. Agglutinins were detected in the sera of infected chickens as early as one week PI, when the mean titer was 1:5, and it reached a maximum of 1:128 at six weeks PI. Thereafter the titer gradually declined, but the demonstrable agglutinins were present until 25 weeks PI.

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Summary A case of oral dermatophilosis in a buffalo calf is reported. The lesions were present on tongue, gums and cheeks. Organisms indistinguishable from Dermatophilus congolensis were demonstrated in the lesions and could be isolated. The isolate of Dermatophilus congolensis when used for experimental reproduction of the disease in buffalo calves produced mild and limiting disease with multiplication of the organisms in the lesion. Zusammenfassung Dermatophilose (Streptothrichose) bei einem Büffelkalb (Bubalus bubalis) Es wird von einem Fall oraler Dermatophilose bei einem Büffelkalb berichtet. Die Läsionen befanden sich auf der Zunge, den Gaumen und Backen. Der Erreger, der sich als typisch für Dermatophilus congolensis erwies, konnte in den Läsionen nachgewiesen und isoliert werden. Das Isolat von Dermatophilus congolensis, das für die experimentelle Reproduktion der Krankheit bei Büffelkälbern verwendet worden war, verursachte eine leichte und begrenzte Erkrankung mit Vermehrung der Erreger in den Läsionen. Résumé On rapporte un cas de dermatophilose buccale chez un veau de buffle. Les lésions se situaient sur la langue, le palais et les joues. L'agent, qui a montré les caractires de Dermatophilus congolensis, a pu être mis en évidence dans les léions et isolé. La souche de Dermatophilus congolensis utilisée pour la reproduction expérimentale de la maladie chez des veaux de buffle provoqua une légère affection limitée avec multiplication du germe dans les lésions. Resumen Dermatofilosis (estreptotricosis) en un ternero de búfala (Bubalus bubalis) Se informa sobre un caso de dermatofilosis oral en un ternero de búfala. Las lesiones se encontraban en la lengua, el paladar y carrillos. El agente etiológico, que resultó ser típico para Dermatophilus congolensis, se pudo identificar en las lesiones y aislar. El Dermatophilus congolensis aislado, que se había utilizado para la reproducción experimental de la enfermedad en terneros de búfala, ocasionó una afección ligera y limitada con multiplicación de los agentes en las lesiones. Dermatophilose (Streptothricose) chez un veau de buffle (bubalus bubalis)

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