Sanjat Kanjilal1, Michael J Mina2. 1. Department of Population Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. 2. Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Center for Communicable Disease Dynamics, Department of Epidemiology and Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, USA. Electronic address: mmina@hsph.harvard.edu.