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Association of Yersinia enterocolitica with the manufacture of cheese and occurrence in pasteurized milk.

机译:小肠结肠炎耶尔森氏菌与干酪的生产以及在巴氏消毒牛奶中的存在有关。

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Raw milk in southern Ontario frequently contains Yersinia enterocolitica. The potential for transmission of this organism by cheese manufactured from unpasteurized milk was evaluated by examination of milk and cheese curd samples from cheese manufacturing plants and finished cheddar and Italian cheeses. The incidence of Y. enterocolitica was lower in cheese curd samples (9.2%) than in raw milk (18.2%). Most of the curd samples showed a positive phosphatase test, indicating production from raw milk. One curd sample yielded Y. enterocolitica after 4 weeks of storage at 4 degrees C but was negative after 8 weeks. All samples of cheddar and Italian cheeses, most of which showed a positive phosphatase test, were negative for Y. enterocolitica. One out of 265 samples (0.4%) of pasteurized fluid dairy products contained Y. enterocolitica.
机译:安大略省南部的生牛奶中经常含有小肠结肠炎耶尔森氏菌。通过检查奶酪制造厂以及切达干酪和意大利奶酪成品中的牛奶和奶酪凝乳样品,评估了由未经巴氏消毒的牛奶制成的奶酪传播这种生物的可能性。干酪凝乳样品中小肠结肠炎耶尔森菌的发生率(9.2%)低于生乳中的小肠结肠炎耶尔森菌(18.2%)。大部分凝乳样品显示出阳性的磷酸酶测试结果,表明是从原料乳中提取的。 1个凝乳样品在4摄氏度下储存4周后产生小肠结肠炎耶尔森氏菌,但8周后呈阴性。切达干酪和意大利干酪的所有样品中大多数都显示出阳性的磷酸酶检测结果,而肠球菌却呈阴性。巴氏消毒液体乳制品的265个样本中有1个(0.4%)含有小肠结肠炎耶尔森氏菌。

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