Patch tests with killed sonicated microflora in patients with psoriasis

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Abstract
• Heat-killed sonicated suspensions ofMalassezia ovalisandStaphylococcus epidermidiswere applied to the intact volar surface of the forearm of ten patients with psoriasis and ten control subjects. All ten of the patients with psoriasis reacted toM ovalis, and four patients reacted toS epidermidis. Two of the control subjects responded toM ovalis, and none responded toS epidermidis. Lesions that both clinically and histologically were consistent with those of psoriasis developed in the patients with psoriasis. (Arch Dermatol1982;118:322-325)