1. Department of Microbiology and Molecular Pathogenesis, Texas A&M University System Health Science Center, College Station, Texas
2. Department of Medical Microbiology and Immunology, University of California at Davis, Davis, California
3. Department of Molecular Genetics and Microbiology, University of Massachusetts Medical Center, Worcester, Massachusetts
4. Departments of Microbiology and Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington