methicillin-resistant Staphylococcus aureus: a type of bacteria that antibiotics cannot kill and can make people very ill. It is often found in hospitals and is sometimes called a superbug. 耐甲氧西林金黄色葡萄球菌(一种抗生素无法消灭的细菌,常被发现于医院,严重致病,有时被称为超级细菌)
biologya simple living thing that is smaller than bacteria and that can enter your body and make you ill. If your body can protect itself against a particular virus, then you are immune to it. A vaccine is a medicine that makes you immune to a particular virus 病毒;滤过性病毒