1. Department of Microbiology and Immunology, Drexel Institute for Biotechnology and Virology Research of Drexel University, Pennsylvania Commonwealth Institute, Doylestown, Pennsylvania 18901, Immunotope, 3805 Old Easton Road, Doylestown, Pennsylvania 18901, The Institute for Virus and Hepatitis Research, Pennsylvania Commonwealth Institute, Doylestown, Pennsylvania 18901, and Saint Louis University School of Medicine, 1402 S. Grand FDT 12th Floor, St. Louis, Missouri 63104