Hilary Humphreys is Professor of Clinical Microbiology at the Royal College of Surgeons in Ireland and Consultant Microbiologist in Beaumont Hospital, Dublin. He has a longstanding research interest in hospital infections, has published widely on many aspects of this and he has led a number of guideline groups in Ireland and in the UK. He has been involved in the teaching of both undergraduate and graduate entry medical students for some years as well as pharmacy students and others. He has developed online material as part of blended learning and he is a former National Specialty Director for Clinical Microbiology in Ireland. Will Irving has been Professor and Honorary Consultant in Virology at the University of Nottingham and Nottingham University Hospitals NHS Trust since 2002. His research interest is in the natural history of hepatitis C virus infection, and has published extensively on this subject. He co-chairs