About the Authors
- Edward C. Holmes
- Center for Infectious Disease Dynamics, Department of Biology, The Pennsylvania State University, Mueller Laboratory, University Park, Pennsylvania, United States of America
- Edward C. Holmes, Bryan T. Grenfell
- Fogarty International Center, National Institutes of Health, Bethesda, Maryland, United States of America
- Bryan T. Grenfell
- Department of Ecology and Evolutionary Biology and Woodrow Wilson School, Princeton University, Princeton, New Jersey, United States of America
The authors have declared that no competing interests exist.