**Acknowledgements**

The research works on TB were supported by the grants, RG/2006/HS/07 NSF and 07-47 of NRC and by IFS, Sri Lanka. I am expressing my sincere gratitude to Professor Jennifer Perera and Dr. N.V. Chandrasekaran for their valuable guidance and Dr. D. Medagedara and Professor V. Thevanesam for their support in tuberculosis research and to Ms. R. P. Waniga‐ tunge for technical support in preparation of manuscript.
