Abstract
The pathogenesis of infection with Escherichia coli was studied in chickens using live O78:K80 cells and a heat-labile chick lethal toxin. The results obtained were compared with those observed in field outbreaks. The common histological findings of subepicardial edema and congestion, focal necrosis in the spleen and focal necrosis, congestion, edema and accumulation of fibrin in the liver support an active role for chick lethal toxin in the pathogenesis of E. coli disease.
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