1. Departments of Surgery (Ophthalmology) and Pediatrics (Infectious Disease), The University of Chicago, Chicago, Illinois 60637
2. Laboratoire Adaptation et Pathogénie des Micro-Organismes, CNRS UMR 5163, Université Joseph Fourier Grenoble 1, Institut Jean Roget, BP 170, 38042 Grenoble Cedex 9, France
3. Centre d'Innovation, Génome Québec, Montréal, Québec H3A 1A4, Canada
4. INSERM, U563, F-31000 Toulouse, France
5. University Toulouse III Paul Sabatier, F-31000 Toulouse, France