Dr. P.C. Verma M.V.Sc, Ph.D, Principal Scientist, B.P. Division, I.V.R.I, Izatnagar. The co-author has been serving as Scientist in ICAR for 30 years. He is a specialist in the area of viral immunology. He has been teaching various courses of immunology for post graduate and doctoral students for past two decades in I.V.R.I. He has guided many students in immunology.