1. Nuffield Department of Medicine, The Jenner Institute, Oxford, OX3 7DQ, UK
2. The Pirbright Institute, Guildford, Surrey, GU24 0NF, UK
3. Department of Infectious Disease, Imperial College – London, W2 1PG, UK
4. School of Psychology and Neuroscience, University of Sussex, Falmer, BN1 9QH, UK
5. Viral Pseudotype Unit, School of Life Sciences, University of Sussex, Falmer, BN1 9QG, UK