1 Infectious Disease Medicine, Saint Johns Cancer Institute, Santa Monica, CA, USA.
2 Institute for Systems Biology, Seattle, WA, USA.
3 Viral Pathogenesis and Evolution Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
4 Viral Pathogenesis and Evolution Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA. taubenbergerj@niaid.nih.gov.