1 Department of Infection, Hull University Teaching Hospitals NHS Trust, Hull, United Kingdom.
2 Department of Infection and Tropical Medicine, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom.
3 Department of Infection, Hull University Teaching Hospitals NHS Trust, Hull, United Kingdom; Hull York Medical School, University of York, United Kingdom.
4 PHE Incident Team, Public Health England, National Infection Service, London NW9 5EQ, United Kingdom.
5 Department of Infection and Tropical Medicine, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom; Translational and Clinical Research Institute, Immunity and Inflammation Theme, Newcastle University, United Kingdom. Electronic address: christopher.duncan@ncl.ac.uk.
6 Department of Infection and Tropical Medicine, The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom. Electronic address: Matthias.schmid1@nhs.net.