1 Laboratory of Virology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA.
2 The Jenner Institute, University of Oxford, Oxford, UK.
3 Rocky Mountain Veterinary Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA.
4 The Jenner Institute, University of Oxford, Oxford, UK. sarah.gilbert@ndm.ox.ac.uk.
5 Laboratory of Virology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, USA. vincent.munster@nih.gov.