1. From the Departments of Ophthalmology and the 2School of Infection and Host Defence, University of Liverpool, Liverpool, United Kingdom; and
2. From the Departments of Ophthalmology and
3. Medical Microbiology, Royal Liverpool University Hospital, Liverpool, United Kingdom;
4. the School of Infection and Host Defence, University of Liverpool, Liverpool, United Kingdom; and
5. Moorfields Eye Hospital, London, United Kingdom.