About the Authors

Neil J Bennett

Affiliation Division of Virology, Department of Pathology, University of Cambridge, United Kingdom

Janet S May

Affiliation Division of Virology, Department of Pathology, University of Cambridge, United Kingdom

Philip G Stevenson

To whom correspondence should be addressed. E-mail: pgs27@mole.bio.cam.ac.uk

Affiliation Division of Virology, Department of Pathology, University of Cambridge, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

PGS conceived and designed the experiments. NJB, JSM, and PGS performed the experiments. PGS analysed the data and wrote the paper.