For three months I prepared specimens in solutions of potassium hydroxide at the New York Skin and Cancer Hospital and examined them microscopically for ringworm fungus. During this period (April, May and June, 1930), the frequency of ringworm in the clinics was exceeded only by that of eczema. Exactly 7,661 new patients came to the skin clinics and a diagnosis of tinea was made in 651 of the cases: this was 8.49 per cent, or approximately 1 in every 12 cases presented. Of these 651 patients, 585 were sent to the laboratory for microscopic examination of lesions.
There were many so-called "borderline" cases, i. e., cases that could not definitely be diagnosed as tinea by clinical appearance alone, yet were sufficiently suggestive of ringworm to warrant a microscopic examination. In compiling these figures, reexaminations were not included. Only the results of examinations made on the first appearance in the
LIGHT SE. MICROSCOPIC DEMONSTRATION OF RINGWORM: RESULTS OF SEVEN HUNDRED AND THIRTY-THREE EXAMINATIONS. Arch Derm Syphilol. 1931;24(1):108–109. doi:10.1001/archderm.1931.01450010113010
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