医院内感染是目前公共卫生中的一个重要问题。在美国医院内交叉感染每年大约有200万人。一般说来,住院病人中有5～10%在医院内发生感染,而这种感染在报告中常常被忽略的有;(1)潜伏期或无症状的感染;(2)误诊的感染;(3)住院时感染而出院后才出现症状。例如:葡萄球菌乳腺脓肿和乙型肝炎等。让我们估计一下院内感染的经济损失费用:每年在美国住院的人有3,000万,如有5%的人发生医院内感染,那就有150万人。如果由于感染,每个病人平均需要延长住院时间7天,那么就要多花1000元(这1000元中还不包括病人因发生感染延长住院时间而在工作上的损失,以及感染造成的病人残废和死亡)。总的说来,在美国每 Infection in the hospital is an important issue in public health. Cross-infection in U.S. hospitals is estimated at about 2 million people each year. In general, 5 to 10% of hospitalized patients have an infection in a hospital, and the infection is often overlooked in the report; (1) latent or asymptomatic infections; (2) misdiagnosed infections; (3 ) Symptoms were found after hospitalization and hospital discharge. For example: staphylococcal abscess and hepatitis B and so on. Let us estimate the economic loss of nosocomial infections: 30 million people will be hospitalized in the United States each year, and 1.5 million if 5% of people have nosocomial infections. If, due to infection, each patient on average needs to extend the length of stay by 7 days, an extra 1,000 yuan will be required (this 1,000 yuan does not include the loss of work due to prolonged hospitalization due to an infection and disability of the patient due to infection And death). Overall, in the United States each