Asymptomatic secondary TB with negative bronchoscopy is not infectious, but regular sputum cultures and bronchial examinations are still recommended. Asymptomatic secondary tuberculosis indicates that the tuberculosis attack is a second attack, but there are no obvious symptoms of tuberculosis infection. A negative bronchoscopy indicates that there is no obvious Mycobacterium tuberculosis activity in the sputum or bronchoscopy, and the infection is not contagious. Mycobacterium tuberculosis infection occurs during the active phase of Mycobacterium tuberculosis, when all pathogenetic tests are positive. For patients with asymptomatic secondary TB, even if the bronchoscopy is negative and they are not contagious, they should still take personal protective measures and try not to share dishes or personal belongings with others. Regular sputum culture and bronchoscopy can help determine the activity of Mycobacterium tuberculosis and symptoms of bronchial damage. Asymptomatic secondary TB is not contagious, so you can live a normal life, but you need to be checked regularly.