1. Department of Microbiology and Immunology; University of Maryland School of Medicine; Baltimore MD USA
2. Procter & Gamble Co.; Cincinnati OH USA
3. Department of Pathology; University of Maryland School of Medicine; Baltimore MD USA
4. Cellular and Molecular Medicine Program; The Johns Hopkins University School of Medicine; Baltimore MD USA
5. Division of Medical Microbiology; Department of Pathology; The Johns Hopkins University School of Medicine; Baltimore MD USA