About the Authors
University of Oxford, Department of Zoology and Peter Medawar Building for Pathogen Research, Oxford, United Kingdom
Imperial College London, Sir Alexander Fleming Building, South Kensington, London, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: ZK SPS. Performed the experiments: ZK AMB SBP MSCB. Analyzed the data: ZK SBP MSCB SPS. Contributed reagents/materials/analysis tools: HCJG RES. Wrote the paper: ZK SPS.