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Studies on the pathogenesis of Escherichia coli in the bursa of Fabricius (cloacal bursa) of the turkey



Studies on the pathogenesis of Escherichia coli in the bursa of Fabricius (cloacal bursa) of the turkey



American Journal of Veterinary Research 40(9): 1223-1226



Turkey poults were inoculated with avirulent or virulent E. coli strains by direct application to anal lips and were killed at 0.1, 2, 5, 10, 24, 48, 72 and 96 h post-inoculation (PIH). Bursae of Fabricius (cloacal bursae) were collected, cultured and examined by EM, light and fluorescent microscopy. The virulent strain of E. coli was not recovered from the bursae after 24 PIH, although the avirulent strain was recovered up to 96 PIH. E. coli strains neither localized at nor associated with the bursal fold epithelium, passed through the follicular pad epithelium nor caused cytopathologic changes in the lymphoid follicle. Mild catarrhal bursitis was observed at 48 PIH with the avirulent strain of E. coli.

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Accession: 000757834

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PMID: 393148



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