Massa S, Gardini F, Sinigaglia M, Guerzoni M E
Dipartimento di Protezione e Valorizzazione Agroalimentare, Universita' degli Studi di Bologna, Italy.
J Dairy Sci. 1992 Jun;75(6):1411-4. doi: 10.3168/jds.S0022-0302(92)77894-1.
A high concentration of total and fecal coliforms (5 x 10(8) and 3 x 10(7) cfu/g, respectively) was observed in samples representative of two production lots of Mozzarella cheese from a local dairy. Contamination was manifested by the swelling of plastic pouches and the formation of gas holes in Mozzarella cheese. Aerobic and anaerobic sporeformers, heterofermentative lactic acid bacteria, propionibacteria, and yeasts were absent. Of the 41 isolates identified, there were 37 Klebsiella pneumoniae, 2 Klebsiella oxytoca, 1 Enterobacter aerogenes, and 1 Escherichia coli. Exposure at 63 degrees C for 15 min caused the death of all total and fecal coliforms.
在当地一家乳制品厂的两批马苏里拉奶酪的代表性样本中，观察到总大肠菌群和粪大肠菌群的浓度很高（分别为5×10⁸和3×10⁷ cfu/g）。污染表现为塑料包装袋膨胀以及马苏里拉奶酪中形成气孔。不存在需氧和厌氧芽孢形成菌、异型发酵乳酸菌、丙酸杆菌和酵母。在鉴定出的41株分离株中，有37株肺炎克雷伯菌、2株产酸克雷伯菌、1株产气肠杆菌和1株大肠杆菌。在63℃下暴露15分钟导致所有总大肠菌群和粪大肠菌群死亡。
