1 Division of Infection, Royal London Hospital, Barts NHS Trust, London, United Kingdom. Electronic address: Simon.Tiberi@bartshealth.nhs.uk.
2 Emerging Bacterial Pathogens Unit, Division of Immunology and Infectious Diseases, San Raffaele Scientific Institute, San Raffaele Hospital, Milan, Italy.
3 Division of Infection, Royal London Hospital, Barts NHS Trust, London, United Kingdom.