Acknowledgement
We are extremely grateful to Dr. Chitrita DebRoy, Senior Research Associate & Deirector, Gastroenteric Disease Center, Wiley Lab, Penn State University, USA and to Dr. Bhushan Jayarao, Associate Professor, Cooperative Extension, Department of Veterinary Science, Penn State University (USA) for their guidance and help provided in preparing the manuscript. The Department of Microbiology and Biotechnology, M.S. University, Vadodara, India, facilitated the electron microscopic studies. We are thankful to the National Dairy Development Board, Anand, Gujarat for providing the facilities used in the present work.
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