1. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA, USA 2Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Mexico City, Mexico 3State University of New York – Downstate Medical Center, Brooklyn, NY, USA 4Howard Hughes Medical Institute, Albert Einstein College of Medicine, Bronx, NY, USA 5Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA