Sogaard H, Petersen E
Nord Vet Med. 1977 Oct;29(10):429-35.
During one year 1390 samples of pasteurized milk products from five different dairies were examined for content of B. cereus. The examination was done on the day of packaging and after incubation at 17 degrees C for 24 hrs. as well. On examination on the day of packaging 8.1 % were positive. No difference could be demonstrated between low-temperature pasteurized and high-temperature pasteurized products. However, differences were found from one plant to another (2.1 %--14.5 %). After incubation B. cereus were isolated from 17.2 % of low-temperature pasteurized samples and from 22.8 % of high-temperature pasteurized products. The occurrence of B. cereus varied according to season. In July-September the level of contamination was 40 %. It is concluded that during summer months bacteriological examination of dairy products should be supplemented with an examination for B. cereus. This could provide a valuable tool in checking the efficiency of dairy cleaning.
在一年时间里，对来自五个不同乳品厂的1390份巴氏杀菌奶制品样本进行了蜡样芽孢杆菌含量检测。检测在包装当天以及在17摄氏度下孵育24小时后进行。在包装当天检测时，8.1%呈阳性。低温巴氏杀菌产品和高温巴氏杀菌产品之间未显示出差异。然而，不同工厂之间存在差异（2.1% - 14.5%）。孵育后，从17.2%的低温巴氏杀菌样本和22.8%的高温巴氏杀菌产品中分离出蜡样芽孢杆菌。蜡样芽孢杆菌的出现随季节变化。在7月至9月，污染水平为40%。得出的结论是，在夏季，奶制品的细菌学检测应补充蜡样芽孢杆菌检测。这可为检查乳品清洁效率提供一个有价值的工具。
