Intestinal colonization of young chicks with Escherichia coli O157:H7 and other verotoxin-producing serotypes.

The Journal of applied bacteriology Pub Date : 1993-05-01
S Stavric, B Buchanan, T M Gleeson
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Abstract

The susceptibility of chicks to colonization with Escherichia coli O157:H7 and other verotoxin-producing serotypes was studied. The E. coli colonized the caeca of both broilers and layers after oral administration of the challenge. The extent of colonization was dependent on challenge dose, age of chicks at the time of challenge, breed of chicks and length of time after exposure. A rapid increase in caecal colonization and a decrease in crop colonization was evident during the first few hours after challenge, with a maximum in the caeca at 6 h. Escherichia coli persisted in caecal contents as well as on caecal walls throughout the course of the experiments (14 d), but at much lower levels compared with the 6 h post-challenge.

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大肠杆菌O157:H7和其他产生维罗毒素血清型在雏鸡肠道内的定植。
研究了雏鸡对大肠杆菌O157:H7和其他产维罗毒素血清型定植的易感性。大肠杆菌在肉鸡和蛋鸡的盲肠中都有定植。定殖程度与攻毒剂量、攻毒时雏鸡年龄、雏鸡品种和暴露时间长短有关。在攻毒后的最初几个小时内,盲肠定植量迅速增加,作物定植量明显减少,在6小时时盲肠定植量达到最大值。在整个实验过程中(14 d),大肠杆菌持续存在于盲肠内容物和盲肠壁上,但与攻毒后6小时相比,水平要低得多。
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