Department of Microbiology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati - 781 022, (Assam).
*Corresponding author: drsarbani@lycos.com
1Deptt. of Biochemistry, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati - 781 022, (Assam).