1. Department of Microbiology & Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
3. Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
4. Rapidly Emerging Antiviral Drug Discovery Initiative, University of North Carolina, Chapel Hill, North Carolina, USA