The pathogenic bacterium Escherichia coli(E. coli) causehealth problems to production animals, i.e.avian colibacillosis. This disease presents multifactorial causes,manifestingchronic respiratory disease, omphalitis, salpingitis, septicemia, peritonitis, swollen head syndrome, enteritis,and cellulitis. Thepresent study aimed to report clinical findings of three birds from a breeder at Primavera do Leste,MT, Brazil, necropsied to the anatomopathological analysis and isolation of the causative agents. The analysis identified hepatic necrosis, presence of catarrhal secretion to the medial portion of trachea, and cellulitis with evolution to abscess. Microbiological tests resulted to the isolation of lactose-fermentiveGram-negative bacteria, characterizedasenterobacteria, i.e.E. coli.