1. Department of Microbiology; College of Veterinary Science; Assam Agricultural University; Guwahati Assam India
2. National Research Centre on Pig; Guwahati Assam India
3. Avian Viral Diseases Programme; the Pirbright Institute; Newbury Berkshire UK
4. School of Veterinary Medicine and Science; University of Nottingham; Loughborough Leicestershire UK