1Department of Parasitology, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia
2Virology Unit, Infectious Disease Research Centre, Institute for Medical Research, National Institutes of Health, Ministry of Health, Shah Alam, Malaysia
3Department of Pathology, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Malaysia
4Institute for Clinical Research, National Institutes of Health, Ministry of Health, Shah Alam, Malaysia
5Clinical Research Centre, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Malaysia