Children’s tuberculosis is also light and serious: 1, light often can not have any lesions, due to the absence of any symptoms, a part of the patient is physical examination is found, or as a close contact with tuberculosis patients routine examination found, this part of the patient can not have any symptoms, not serious; 2, severe tuberculosis including tuberculous meningitis, tuberculous pleurisy, blood dissemination of tuberculosis, tuberculous pericarditis, Bone tuberculosis and severe urinary system tuberculosis, this part of the tuberculosis patient is still quite serious. Most of them need hospitalization, and some of them even need to be admitted to the ICU for treatment, and the treatment is difficult, and a small number of patients even have a certain degree of disability. For example, tuberculous meningitis, may be left with mental or mobility disorders; 3, there is also a part of the children patients because of low immunity, including primary immunodeficiency patients, such as chronic granulomatous disease, neutrophil defects, secondary immunodeficiency, such as AIDS, or immune dysfunction, rheumatoid arthritis, long-term oral hormone therapy, this part of the patient because of low immunity, treatment is very difficult, and the prognosis is very poor. The prognosis for this group of patients is relatively poor because they are immunocompromised, and the treatment is difficult and the prognosis is relatively poor.