1. From the Departments of Ophthalmology and2Microbiology and Immunology, University of Oklahoma Health Sciences Center, Dean A. McGee Eye Institute, Oklahoma City, Oklahoma; and
2. From the Departments of Ophthalmology and
3. Dipartimento di Patologia Sperimentale, Biotecnologie Mediche, Infettivologia ed Epidemiologia, Universita´ di Pisa, Pisa, Italy.