1. Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
2. Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
3. Stanford Blood Center, Stanford Health Care, Stanford, California, USA
4. Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology, La Jolla, California, USA
5. Department of Medicine, Division of Infectious Diseases and Global Public Health, University of California, San Diego, La Jolla, California, USA
6. Clinical Virology Laboratory, Stanford Health Care, Stanford, California, USA
7. Clinical Microbiology Laboratory, Stanford Health Care, Stanford, California, USA