1. Department of Medical Microbiology, Faculty of MedicineUniversity of Malaya, 50603 Kuala Lumpur, Malaysia
2. Julius Centre University of Malaya, Department of Social and Preventive Medicine, Faculty of MedicineUniversity of Malaya, 50603 Kuala Lumpur, Malaysia
3. Department of Veterinary Services, Ministry of Agriculture and Agro-Based Industry Malaysia, Federal Government Administrative Centre, 62630 Putrajaya, Malaysia