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 a series editor and volume editor of several volumes with Current Topics in Microbiology and Immunology. Michael B.A. Oldstone is a Professor at the Department of Immunology and Microbial Science at the Scripps Research Institute, La Jolla, CA, USA and a series editor and volume editor of several volumes with Current Topics in Microbiology and Immunology.