Pinto B, Reali D
Department of Public Health and Biostatistics, University of Pisa-Italy.
Zentralbl Hyg Umweltmed. 1996 Nov;199(1):60-8.
The frequency of L. monocytogenes and other listerias was determined in different types of Italian-made soft cheeses purchased from retail outlets (shops and supermarkets) located in different areas and different towns of central Italy. Of the 164 examined samples, eight proved to be positive for L. monocytogenes (4.9%), seven strains belonged to serotype 1, and one strain to serotype 4. Thirty-six samples were positive for the presence of other listeria species (22%); of these, L. innocua was prevalent (72% of positive samples). The cheeses bought in supermarkets displayed a higher and statistically significant (Fisher's exact test: 0.0016) positivity for Listeria spp. than those sold by the shops, independently of the type of cheese. One particular type of cheese proved to be frequently contaminated (Fis. ex. test: 0.0013). Technical, analytical and epidemiological aspects are discussed.
对从意大利中部不同地区和不同城镇的零售商店（商店和超市）购买的不同类型的意大利软奶酪中单核细胞增生李斯特菌和其他李斯特菌的频率进行了测定。在164个检测样本中，8个被证明单核细胞增生李斯特菌呈阳性（4.9%），7个菌株属于血清型1，1个菌株属于血清型4。36个样本因存在其他李斯特菌属而呈阳性（22%）；其中，无害李斯特菌最为普遍（占阳性样本的72%）。无论奶酪类型如何，在超市购买的奶酪中李斯特菌属的阳性率均高于商店销售的奶酪，且具有统计学显著性（Fisher精确检验：0.0016）。有一种特殊类型的奶酪被证明经常受到污染（Fisher精确检验：0.0013）。文中讨论了技术、分析和流行病学方面的问题。
