Antimycobacterial Efficacy ofAndrographis paniculataLeaf Extracts Under Intracellular and Hypoxic Conditions

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The inhibition of the growth of Mycobacterium tuberculosis by the extracts of Andrographis paniculata has been studied using intracellular and axenic hypoxic conditions. The inhibition (confirmed using the gold standard colony forming unit assay) was found to increase with “double stimuli” or higher concentration of the extract. Organic solvent extracts were found to inhibit bacterial growth more than the aqueous extracts under microaerophilic conditions mimicked through axenic and intracellular assays. This could be further explored to evaluate the potential of the plant to be used against nonreplicating/dormant bacilli.

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