LXVIII.—CULTIVATION AND STUDY OF PITYROSPORUM OVALE, THE SO-CALLED BOTTLE BACILLUS OF UNNA

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Abstract
The growth and study of the so-called bottle bacillus of Unna or pityrosporon of Malassez has for a number of years been a problem not only to dermatologists but to bacteriologists. Its universal presence in cases of seborrhea capitis and seborrhea corporis has led to controversial opinions as to the rôle this particular organism has in these conditions. The fact that it has been noted in dandruff scales, in comedones and in scrapings from psoriatic lesions in addition to the aforementioned forms of seborrhea, leads one to suspect some connection with the disorder other than that of saprophytism or chance contamination. Because of its significant association with the conditions mentioned, the necessity for proving or disproving the pathogenic relationship of this organism was urged on me by Dr. Martin F. Engman Sr. Whether or not Pityrosporum ovale is the etiologic agent of seborrhea, psoriasis or the various forms of dermatitis

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