TYPES OF DERMATITIS IN AMERICAN ONCHOCERCIASIS

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Abstract
IN A previous communication1 the general background of American onchocerciasis was given. In this report an attempt will be made to describe in detail the different forms of dermatitis that were observed, for the most part, at the research center of onchocerciasis, Centro Médico, Huixtla, Chiapas, Mexico. This research hospital has been placed in the state of Chiapas in an area in which onchocerciasis is heavily endemic. The incidence of the disease here has been estimated at 20,000 by González Herrejón.2 It is difficult to analyze critically the cutaneous reactions observed in patients infected by the filariae worm, Onchocerca volvulus, for the following reasons: Many areas of skin, structurally normal, grossly and even microscopically, and also free of subjective reactions, may show numerous microfilariae in that portion. The vector of the disease, the Simulium, produces an erythemaedema and petechial reaction, with the intensity of

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