Listeria monocytogenes can cause circling disease, encephalitis, meningitis, septicemia, and mastitis in dairy cattle. Contamination from the environment can contaminate foods with Listeria spp. Consumption of foods containing L. monocytogenes can lead to listeriosis in susceptible people (adults with a compromised immune system), pregnant women, and infants. The objective of this study was to determine the prevalence of Listeria spp. and L. monocytogenes in various foods in Iran. We searched PubMed, Science direct, Scopus, Google scholar, and Iranian local databases including Iranian scientific information database and Magiran for relevant studies up to May 2015 using related keywords. In our preliminary search, we retrieved 1344 articles. After removing duplicates and reviewing titles/abstracts, 117 articles were considered, out of which, 75 articles had sufficient quality for inclusion in this meta-analysis. The prevalence of Listeria spp. contamination was about 18.3% in poultry, 8.5% in raw meat, 14.6% in ready-to-eat (RTE) foods, 10% in sea foods, 7.3% in traditional dairy, 3.2% in commercial dairy, and 0.1% in eggs. The findings showed that L. monocytogenes was most prevalent in ready to eat (9.2%), seafood (5.1%), poultry (5%), traditional dairy (4%), raw meat (2.6%), commercial dairy (1.4%), and egg (0.2%), respectively. Furthermore, the presence of L. monocytogenes particularly in RTE foods (that are consumed without further heat processing) and under-cooked products could be a potential risk for public health. So, contamination should be controlled at all levels of the food chain.

单核细胞增生性李斯特菌可引起奶牛的循环疾病，脑炎，脑膜炎，败血病和乳腺炎。来自环境的污染会污染李斯特菌属的食品。食用含L的食物。单核细胞增生症可导致易感人群（免疫系统受损的成年人），孕妇和婴儿出现李斯特菌病。这项研究的目的是确定李斯特菌属的流行。和单核细胞增生李斯特菌在伊朗的各种食物中。我们使用相关关键字搜索了PubMed，Science direct，Scopus，Google Scholar和包括伊朗科学信息数据库和Magiran在内的伊朗当地数据库，以进行相关研究（截至2015年5月）。在我们的初步搜索中，我们检索了1344篇文章。在删除重复项并审查标题/摘要后，考虑了117篇文章，其中75篇文章的质量足以纳入本荟萃分析。李斯特菌属的流行。家禽中的污染物约为18.3％，生肉中的污染物为8.5％，即食（RTE）食品中的污染物为14.6％，海鲜中的污染物为10％，传统乳制品的污染物为7.3％，商业乳制品的污染物为3.2％，鸡蛋的污染物为0.1％ 。研究结果表明单核细胞增生李斯特菌即食（9.2％），海鲜（5.1％），家禽（5％），传统乳制品（4％），生肉（2.6％），商业乳制品（1.4％）和鸡蛋（0.2％）最为普遍）， 分别。此外，单核细胞增生李斯特氏菌的存在，特别是在RTE食品（未经进一步热处理就可以食用）和煮熟的产品中，可能对公众健康构成潜在风险。因此，应在食物链的各个层面上控制污染。