肺结核病是由结核杆菌引起的一种慢性呼吸道传染病。世界卫生组织(WHO)报告,全球有17亿人感染结核,现有结核病人2000万,每年新发病人数800万,每年死亡300万。1990年第三次全国结核病流行病学抽样调查有肺结核病人593万,占全球病人数的29.7％,每年死亡23万,占传染病死亡率的 Tuberculosis is a chronic respiratory infection caused by Mycobacterium tuberculosis. The World Health Organization (WHO) reports that 1.7 billion people worldwide are infected with TB. The existing TB population is 20 million and the number of newly infected patients is 8 million each year, with 3 million deaths each year. The third national epidemiological survey of tuberculosis in 1990 found that 5.93 million were tuberculosis patients, accounting for 29.7% of the global total, accounting for 230,000 deaths a year, accounting for the death rate of infectious diseases