1. Department of Infectious Diseases, St James’s Hospital, D08 NHY1 Dublin, Ireland
2. Department of Infectious Diseases, University Hospital Galway, H91 YR71 Galway, Ireland
3. Health Protection Surveillance Centre, D01 A4A3 Dublin, Ireland
4. Department of Occupational Medicine, St James’s Hospital, D08 NHY1 Dublin, Ireland
5. Department of Clinical Medicine, Trinity College Dublin, D02 PN40 Dublin, Ireland