Onychomycosis, causative organism Microsporum audouini.
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Three cases of scalp involvement by M. canis in infants are briefly reported. The first was a 2-month-old female with a few erythematous spots on the scalp, the second an 8-month-old male with lesions resembling seborrhoeic dermatitis and the third an 11-month-old male having areas of folliculitis of a kerion type. The father of the second case was found to have a tinea barbae infection due to the same fungus. Stray kittens were the most probable source of infection in all these cases.
During a period of 8 years 300 cases of dermatophytoses involving both hairy areas and the glabrous skin were found to be caused by M. canis. There was scalp involvement in 60%, including 8 infants and 27 adults; most of the adults presented Kerion-like lesions and presented various clinical aspects such as seborrhea capitis, folliculitis and discoid lupus erythematosus. In the 21 patients showing invasion of the beard the clinical manifestations included superficial erythemato-squamous patches with hyperemic slightly elevated margins, folliculitis or abscess-like lesions and Kerion-like lesions. Among the lesions found on the glabrous skin there were unusual aspects of tinea faciei in 19 adults, mimicking lymphocytic infiltration, granuloma faciale or discoid lupus erythematosus. Some of the cases of tinea corporis found in 70 patients also had lesions simulating various other dermatological entities, including erythema multiforme, psoriasiform eruption, pityriasis rosea and seborrheic dermatitis. The hands were invaded in 5 adults patients, with involvement of the finger nails in one. Repeated mycologic examinations were necessary to establish the true etiology in many of these cases.
The mycid reaction in the form of exudative gonarthritis was observed in the case of a 65-year-old farmer suffering from a profound mycosis of the chin.
A small epidemic of tinea corporis due to M. gypseum is reported. There were 13 children affected, ages 1-15 years. These children belonged to 6 neighbouring families and all used a common "playground", an empty lot located nearby. Cultures were positive for M. gypseum in the 13 children and the agent was also isolated from 2 soils collected in the playing-ground. Soil isolates were classified as N. gypsea. Clinically, the lesions were circinated and had active borders, they were preferentially located in the trunk. Most children (8/13) had multiple lesions. These and other pertinent aspects are discussed in the text.
A group of 199 healthy laboratory animals, comprising 63 guinea pigs; 58 white mice. 47 rats and 31 rabbits, was sampled for the presence of pathogenic dermatophytes. T. mentagrophytes, var. granulare, was isolated in 10% (5-guinea pigs, 6 mice, 6 rats and 2 rabbits) and M. gypseum was found in 7 animals (3 guinea pigs, 3 mice and one rat). No ringworm lesions were observed in the respective animals. This is the first report on such findings in Israel.
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