As far as we know, of those persons who are in close contact with an infectious tuberculosis patient-such as family members and co-workers-roughly one in three will become infected. A patient with an active case of tuberculosis can on average infect ten to 15 healthy people per year with the TB bacillus.
據目前所知，與傳染性肺結核病人進行親密接觸者，如家人、同事，有三分之一會遭到感染；一個開放性結核病人，平均在一年中可以造成十至十五位正常人感染結核菌。