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近年来国内外结核病流行形势十分严峻，部队内新病例、死亡率也逐年上升。为制定防治措施，我们于１９９５年１２月对某部８４６名新兵进行了结核菌素（ＰＰＣ）试验，并对发病情况进行了３年随访观察。１ 对象和方法 （１）对象：１９９５年１２月入伍新兵，男性，年龄１６?
In recent years, the prevalence of tuberculosis both at home and abroad has been very grim. New cases and death rates in the armed forces have also risen year by year. In order to formulate prevention and control measures, we conducted a test of tuberculin (PPC) on 846 recruits in December 1995 and conducted a 3-year follow-up observation on the incidence. 1 objects and methods (1) target: December 1995 recruits, male, age 16?