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is a live attenuated vaccine and produces partial immunity up to 75% against tuberculosis
infection. That means - one is not completely immunized as to prevent future TB infections. Further BCG vaccine is usually safe and causes only minor symptoms. Very rarely if the general condition or immunity is compromised during vaccination
, vaccine may induce an infection.
In simple words, as the biopsy
revealed TB infection, it is very clear that your son is infected with tuberculosis and the antitubercular drugs prescribed to him will definitely benefit him. He may have got the infection through a contact or through the vaccine (very rare).
Therefore it is really necessary that he takes him medications regularly as advised by his doctors. Follow up with him doctors for proper and complete treatment. And the condition will not regress on by itself. Treatment is mandatory.
Hope this answers your query.
Wish him a safe recovery