1. Department of Pharmaceutical Sciences, College of Pharmacy, and UICentre, University of Illinois at Chicago, Chicago, Illinois 60612, United States
2. Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612, United States
3. Department of Microbiology, Boston University School of Medicine, National Emerging Infectious Diseases Laboratories, Boston, Massachusetts 02118, United States
4. Department of Virology and Immunology, Texas Biomedical Research Institute, San Antonio, Texas 78227, United States