1 Center for Communicable Disease Dynamics, Harvard TH Chan School of Public Health, Boston, MA 02115, USA; Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, MA 02115, USA. Electronic address: derek.macfadden@mail.harvard.edu.
2 Center for Communicable Disease Dynamics, Harvard TH Chan School of Public Health, Boston, MA 02115, USA; Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, MA 02115, USA.
3 Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, MA 02115, USA; Department of Immunology and Infectious Diseases, Harvard TH Chan School of Public Health, Boston, MA 02115, USA.
4 Department of Immunology and Infectious Diseases, Harvard TH Chan School of Public Health, Boston, MA 02115, USA.