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So long as a specific parasite for alopecia areata remains undiscovered or is not proven beyond a doubt, so long will the parasitic theory as applied to this affection encounter many adversaries. In favor of this theory in default of the parasite itself there are certain facts of contagion which are definitely proven, and which cannot be regarded as simple coincidences. Among the cases of alopecia which we have had occasion to study in the wards of the St. Louis in the services of Drs. Hallopeau and Vidal, we have noted different ways of transmission from one individual to another of variable degrees of importance.
Here are certain examples of the first order of facts which we are able to see quite frequently: First. A small girl is affected with alopecia; her sister sleeping in the same bed is ere long attacked with the same disease. Second. Three children of
WICKHAM L. NOTES ON THE PARASITIC THEORY OF ALOPECIA AREATA. Read in the Section of Dermatology and Syphilography, at the Fortieth Annual Meeting of the American Medical Association, June, 1889. JAMA. 1890;XIV(7):235–237. doi:10.1001/jama.1890.02410070019001d
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