食物链的微生物学 单核细胞增生李斯特菌和李斯特菌的水平检测和计数方法 -第1部分:检测方法-修改1:包括分析前样品的储存和培养基和试剂性能试验对照菌株的变化Microbiology of the food chain - Horizontal method for the detection and enumeration of Listeria monocytogenes and of Listeria spp. - Part 1: Detection method - Amendment 1: Inclusion of storage of the samples before analysis and changes in the control strain for performance testing of culture media and reagents