Does infection and recovery from Tuberculosis lead to immunity?

I was wondering if you become exposed to TB, and are treated or carrying it as latent TB, will you produce immunity that will stay with you forever. I am researching the newer QuantiFERON-TB Gold® test, and didn't know if it would stay positive for life in those with past infection not just current or latent... show more I was wondering if you become exposed to TB, and are treated or carrying it as latent TB, will you produce immunity that will stay with you forever. I am researching the newer QuantiFERON-TB Gold® test, and didn't know if it would stay positive for life in those with past infection not just current or latent infection.
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