Pathology of swollen head syndrome in broiler chickens
1997
Ishii, E. (Iwate Univ., Morioka (Japan). Faculty of Agriculture) | Goryo, M. | Kikuchi, S. | Okada, K.
Broiler cases of swollen head syndrome (SHS) occurring at three different farms and showing respiratory symptom, swollen heads and severe depression were studied pathologically. At necropsy affected chickens showed the swollen head and eyelids due to facial cellulitis with caseous exudate in the air space of the cranial bones but no exudate in the lumen of the infraorbital sinus and the nasal cavity. Microscopy revealed chronic fibrinopurulent inflammation with granulomas in the air space of the cranial bones, middle ears and facial skin. Conjunctivitis and tracheitis with infiltration of lymphocytes and plasma cells with germinal centers were observed. The E. coli isolate from the wattle of an affected chicken was inoculated intramuscularly (10(7) CFU) into 2-weeks-old SPF chicks, and acute fibrinopurulent pericarditis and serositis, but no SHS lesions were produced
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