1. Department of Pathology, Division of Medical Microbiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
2. National Institutes of Allergy and Infectious Disease, Bethesda, Maryland, USA
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
4. Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland,USA
5. Department of Computer Science, Johns Hopkins University, Baltimore, Maryland, USA
6. Bio-Rad Laboratories, Pleasanton, California, USA
7. W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA