translation.en: Which also sounds like, if there is a case of flu, someone gave someone a case of flu, or a cold, or the greatest risk factor of tuberculosis is having been exposed to tuberculosis.
translation.zh: 这就跟流感疫情相似， 就象某人把流感，或者感冒传给别人， 最大的罹患因素就是 结核病的接触史。