Tuberculosis is also contagious with very low positivity. TB is generally spread through the air, droplets and the respiratory tract. TB patients with very low sputum bacterial positivity can release Mycobacterium tuberculosis into the air or other objects through their saliva and then infect others. Early-stage tuberculosis usually has no obvious symptoms or mild symptoms, but its bacterial content or activity of Mycobacterium tuberculosis is high, and it is easy to be infected by close contact with the patient. Therefore, it is possible to be infectious with very low TB positivity. Treatment for TB includes medications and surgery. Isoniazid tablets and rifampicin capsules can be taken. If medication fails to achieve the desired effect, the treatment can be achieved by surgical removal of the lesion. In the course of drug treatment, irregularities such as stopping and reducing the dosage should be avoided. In addition, besides quitting smoking and alcohol, patients with tuberculosis should strengthen nutrition and physical fitness in order to promote the early recovery of patients with tuberculosis. Secondly, manage sputum of patients to prevent the spread of TB. In addition, popularizing vaccination knowledge and BCG vaccination are effective measures to prevent tuberculosis.