Epidemic Koch-Weeks Conjunctivitis and Trachoma* *From the Epidemic Intelligence Service, Communicable Disease Center, U.S. Public Health Service, and the Francis I. Proctor Foundation for Research in Ophthalmology, University of California School of Medicine, San Francisco. I wish to express my gratitude to Dr. Mir S. Mulla, Department of Entomology, University of California, Riverside; to Mr. Arthur Cavanaugh and other members of the Coachella Mosquito Abatement District; to Dr. Everett Stone, the Riverside County Health Officer; and to Dr. and Mrs. Phillips Thygeson for their advice and assistance during the course of this investigation and with the preparation of the manuscript.