1 University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham, UK; Hospital Infection Research Laboratory, University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham, UK; Institute of Microbiology and Infection, The University of Birmingham, Edgbaston, Birmingham, UK. Electronic address: mark.garvey@uhb.nhs.uk.
2 University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham, UK.
3 University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham, UK; Hospital Infection Research Laboratory, University Hospitals Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Edgbaston, Birmingham, UK.
4 University of West London, Richard Wells Research Centre, London, UK.