1. Department of Laboratory Medicine, University of California, San Francisco, San Francisco, California, USA
2. UCSF-Abbott Viral Diagnostics and Discovery Center, San Francisco, San Francisco, California, USA
3. Department of Medicine, Division of Infectious Diseases, University of California, San Francisco, San Francisco, California, USA
4. Viral and Rickettsial Disease Laboratory, California Department of Public Health, Richmond, California, USA
5. Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
6. Texas Biomedical Research Institute, San Antonio, Texas, USA
7. University of Texas Health Science Center, San Antonio, Texas, USA