Richard W. Compans is a Professor of Microbiology and Immunology and Scientific Director of Influenza Pathogenesis and Immunology Research Center, Emory University School of Medicine, Atlanta, GA, USA and series editor and volume editor of several successful volumes of Current Topics in Microbiology and Immunology. Michael B.A. Oldstone is a professor at the Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA, USA and series editor and volume editor of several successful volumes of Current Topics in Microbiology and Immunology.