The tuberculosis vaccine, also known as BCG vaccine, produces lifelong immunity in principle, but tuberculosis can be contracted when the body’s resistance is low. The TB vaccine is usually given at birth and is more effective in preventing TB in infants, but the TB vaccine is relatively ineffective for adults. The TB vaccine enables the body to develop protective antibodies against TB and prevents infection by Mycobacterium tuberculosis. Tuberculosis is an acid-resistant bacterium that is infectious and has a very strong capacity for infection, and the BCG vaccine has limited protective capacity, making it easy to contract tuberculosis if the body is immunocompromised or if there is a history of long-term exposure to tuberculosis patients. However, compared to those who have not received BCG vaccine, those who have received BCG vaccine have relatively mild symptoms of tuberculosis infection and will not develop further into severe tuberculosis such as tuberculous meningitis. It is recommended that patients should pay attention to strengthening exercise in daily life, enhancing physical fitness, strengthening their resistance, staying up less late, and paying attention to the regularity of living and eating.