Is TB vaccine effective for life?

BCG vaccine is not effective for life. Its immunity can last for years to decades. The specific time varies from person to person. Adults may consider revaccination under certain circumstances.

Tuberculosis vaccine is usually referred to as BCG vaccine. It has a considerable effect on preventing tuberculosis in children, especially severe tuberculosis meningitis and miliary tuberculosis. BCG vaccine is not effective for life.

BCG vaccine has a good protective effect on newborns. Vaccination with BCG vaccine can reduce the probability of tuberculosis meningitis and disseminated tuberculosis in children, but it cannot completely prevent the occurrence of tuberculosis. Over time, the body's immunity to BCG will gradually weaken.

Generally speaking, BCG immunity can last for years to decades, but the specific protection period varies from person to person. A number of factors may affect the protective effect of BCG, such as the individual's immune status, living environment, risk of exposure to tuberculosis, etc.

For adults, revaccination may be considered

not been vaccinated and the PPD test is negative.

PPD test mean induration diameter