1. Jenner Institute, University of Oxford, Old Road Campus Research Building, Oxford OX3 7DQ, UK.
2. Lymphocyte Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
3. Centre for Clinical Vaccinology and Tropical Medicine, University of Oxford, Churchill Hospital, Old Road, Headington, Oxford OX3 7LJ, UK.
4. Department of Parasitology, Leiden University Medical Center, 2333 ZA Leiden, Netherlands.
5. Clinical Biomanufacturing Facility, University of Oxford, Churchill Hospital, Oxford OX3 7JT, UK.
6. Nuffield Department of Medicine, University of Oxford, Oxford, UK.