食品和动物饲料的微生物学-凝固酶阳性葡萄球菌(金黄色葡萄球菌和其他种)计数的水平方法-第3部分:低数量菌检测和MPN技术Microbiology of food and animal feeding stuffs - Horizontal method for the enumeration of coagulase-positive staphylococci (Staphylococcus aureus and other species) - Part 3: Detection and MPN technique for low numbers