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医院感染细菌变化的总趋势是革兰氏阳性球菌在逐渐减少而革兰氏阴性杆菌引起的医院内感染不断增加。在革兰氏阴性杆菌的上升趋势中，尤以机会致病菌增加的幅度较大。近三
The general trend of nosocomial bacterial changes is a gradual decrease in Gram-positive cocci while an increase in nosocomial infections caused by gram-negative bacilli. In the upward trend of Gram-negative bacilli, opportunistic pathogens are more greatly increased. Nearly three