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. 2012 Jan 3;7(1):e29631. doi: 10.1371/journal.pone.0029631

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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ß-carotene, the precursor to vitamin A, exhibits no inhibition at the doses studied. Both Retinoic acid and 13-cis Retinoic acid result in dose dependent inhibition on our avirulent strain of M. tb. There is no comparable inhibition against Bacillus Calmette-Guerin (BCG).