Department of Microbiology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati - 22 (Assam)
*Corresponding author: Assistant Professor, Division of Veterinary Pubic Health, F.V.Sc. & A.H. SKUAST-K, Shuhama. Alusteng, Srinagar-l90006, Kashmir. e.mail - hussainakram@rediffmail.com
1Part of MVPH thesis of first author approved by All India Institute of Hygiene & Public Health, Kolkata-73.