Why is the BCG vaccine no longer used?

The BCG vaccine, primarily used for tuberculosis (TB), is no longer widely recommended in many countries due to the decline in TB prevalence and the availability of more effective treatments. Additionally, its efficacy in preventing pulmonary TB in adults is limited, and the vaccine can cause false-positive results in TB skin tests, complicating diagnosis. Consequently, many countries have shifted focus to targeted testing and treatment rather than widespread vaccination. However, it is still used in specific populations with a high risk of TB.