**Acknowledgements**

The authors thank the Director General of Health, Malaysia for the permission to publish and the Director of Institute for Medical Research (IMR), Kuala Lumpur for the support. This work was financially supported by the Ministry of Health Research Grant Scheme (Grant ID: NMRR-11-953-10736). The authors also thank Prof. Vikineswary (University of Malaya), Dr. Wan Abd Al Qadr Imad Wan mothar (UM) and Dr. Rahayu Ahmad (MIP) for critically reviewing this chapter.

## **Author details**

Yew-Keong Choong1 \*, Kavithambigai Ellan<sup>2</sup> , Xiang-Dong Chen<sup>3</sup> and Shaiful Azuar Mohamad4

\*Address all correspondence to: yewkeong11@yahoo.co.uk

1 Phytochemistry Unit, Herbal Medicine Research Center, Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia

2 Virology Unit, Infectious Disease Research Center, Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia

3 Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia

4 Malaysia Nuclear Agency, Kajang, Selangor, Malaysia
