1 Department of Internal Medicine, Division of Infectious Diseases, University of California Davis, Sacramento, CA 95817, USA. Electronic address: andesai@ucdavis.edu.
2 School of Life Sciences, University of Sussex, Brighton, UK.
3 MRC Centre for Global Infectious Disease Analysis, School of Public Health, Faculty of Medicine, Imperial College London, London, UK.
4 International Society for Infectious Diseases, Brookline, MA, USA.