. Tuberculosis is an infectious disease caused by the bacterium Mycobacterium tuberculosis.
. The disease can affect all parts of the body, with pulmonary tuberculosis being the most common form (accounting for 80–85% of total cases) and serving as the primary source of transmission to others.
. Direct sputum smear for AFB: all people with suspected pulmonary tuberculosis symptoms must have their sputum tested.
. To facilitate the patient's diagnosis on the day of the medical examination, testing 2 sputum samples on-site should be applied, instead of testing 3 sputum samples as before. The patient should be carefully instructed on how to collect the sputum sample correctly, the time of sample 1 and sample 2 must be at least 2 hours apart.
Source: Guidelines for diagnosis, treatment, and prevention of tuberculosis No. 1314/QD-BYT 2020.