1. Center for Infectious Disease Modeling and Analysis, Yale School of Public Health, New Haven, Connecticut (C.R.W., A.P., A.P.G.)
2. Agent-Based Modelling Laboratory, York University, Toronto, Ontario, Canada (S.M.M.)
3. Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland (M.C.F.)
4. Emerging Pathogens Institute, University of Florida, Gainesville, Florida (B.H.S.).