Tuberculosis negative can be shared in bed because it is not contagious when it is negative. Patients with pulmonary tuberculosis who are treated with reasonable and regular anti-tuberculosis therapy can generally have their symptoms subside after 2-3 weeks of treatment, and the infectiousness can disappear. Whether the infectiousness of TB disappears depends on the sputum test, and a negative sputum test is considered negative for TB and is not infectious. Sputum test is mainly sputum culture and sputum smear. If sputum smear is negative for Bacillus acidophilus or sputum culture is negative for Mycobacterium tuberculosis, it is regarded as negative sputum test and is not infectious. The key is to standardize and rationalize the medication. The principles of anti-tuberculosis treatment should be early, regular, reasonable, moderate and combined, and the medication should not be stopped without authorization, but should be used regularly. If for any reason the drug is not used, remedial measures should be taken to prevent the occurrence of drug resistance and ultimately to prevent and eliminate relapse.