Abstract
Epidemic keratoconjunctivitis received considerable attention during the early stages of World War II, when it proved a major problem in large industrial plants. After 1943, however, the disease in its epidemic form seemed to disappear except for two small outbreaks in California during 1947-1948, with a corresponding waning of interest in ophthalmological circles as measured by the number of articles appearing in the literature. A recent upsurge of interest in epidemic keratoconjunctivitis as a clinical entity has occurred as a result of reports of a large epidemic in an industrial plant in Windsor, Ontario, Canada,1several small epidemics in a number of Midwestern ophthalmological clinics,2the identification of the reported causal agent as St. Louis encephalitis virus,3and the claim of a fresh isolation in Turkey.4 Epidemic keratoconjunctivitis is characterized by acute conjunctivitis, which is followed some days later by keratitis and the formation of subepithelial

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