Tuberculosis is a disease where the bacterium Mycobacterium tuberculosis infects the lungs. It is a persistent bacterium that grows slowly. Tuberculosis is an infectious disease and quite common historically, often referred to as consumption in the past, as mentioned in the novels of Lu Xun. In modern times, tuberculosis is relatively manageable if the infection has not developed resistance to drugs. Proper anti-tuberculosis treatment can result in a cure rate exceeding 90% on the first attempt. However, if the treatment is not adhered to correctly—if the patient stops taking the medication prematurely or does not follow the prescribed regimen—the bacteria may develop resistance, reducing the effectiveness of the treatment. This is particularly problematic in elderly patients, who might also experience adverse reactions to tuberculosis medications, making treatment difficult. Thus, while tuberculosis is generally treatable, infections with drug-resistant strains can be fatal if not managed properly.