1. Departments of Microbiology and Immunology and Medicine (Division of Infectious Diseases), Albert Einstein College of Medicine, Bronx, New York, USA
2. Departments of Pediatrics and Pathology, Microbiology, and Immunology and Elizabeth B. Lamb Center for Pediatric Research, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
3. Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
4. Department of Microbiology and Molecular Genetics, University of California, Irvine, California, USA
5. Department of Molecular Biology, Princeton University, Princeton, New Jersey, USA