OBJECTIVE To investigate the epidemiological conditions of lower respiratory tract infections and their origins in respiratory intensive care unit (RICU).
目的了解呼吸重症监护室（RICU ）中呼吸功能不全患者下呼吸道感染病原菌的流行状况及来源。
2
Objective To study the characteristics of hospital infection of patients with mechanical ventilation in RICU, so as to discuss the measures for prevention of hospital infection.
目的了解呼吸重症监护病房机械通气患者医院感染的特点，探讨预防感染的措施。
3
Objective to investigate the pathogenic bacteria of nosocomial infection in patients with lung cancer in respiratory intensive care unit (RICU), as well as their drug resistance.