1. Laboratory of Vaccines and Immunotherapeutics; Inst. of Bioscience, Univ. Putra Malaysia, UPM; Serdang Selangor Darul Ehsan 43400 Malaysia
2. Faculty of Biotechnology and Biomolecular Sciences; Univ. Putra Malaysia, UPM; Serdang Selangor Darul Ehsan 43400 Malaysia
3. Faculty of Pharmacy; Univ. Teknologi MARA; Bandar Puncak Alam Selangor Darul Ehsan 43600 Malaysia
4. Strategic Livestock Research Centre, Malaysian Agricultural Research and Development Inst. (MARDI); Persiaran MARDI-UPM; Serdang Selangor Darul Ehsan 43400 Malaysia