1. Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
2. Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
3. Laboratory of Molecular Virology, Millennium Institute on Immunology and Immunotherapy, Centro de Investigaciones Médicas y División de Pediatría, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile.
4. Institute of Medical Virology, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland.
5. Department of Microbiology, University of Chicago, Chicago, IL 60637, USA.
6. Influenza Division, National Center for Immunization and Respiratory Disease, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
7. Saint Louis University School of Medicine, Saint Louis University, St. Louis, MO 63104, USA.
8. Division of Infectious Diseases, Department of Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA.