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青壮年发病率较高的原因首先是因为他们社会活动比较多,到公众场所接触面广泛,使之与在健康人群中存在着结核病人接触机会相对增加。
The reason for the higher incidence of young and middle-aged people is above all because they have more social activities and have extensive contact with public places to increase the chance of encountering TB patients in healthy population.