AN EPIDEMIOLOGICAL, CLINICAL, AND MYCOLOGICAL STUDY OF HUMAN RINGWORM DUE TO <i>TRICHOPHYTON VERRUCOSUM</i> IN JAPAN
March 1975
in “
The Journal of Dermatology
”
TLDR Ringworm from Trichophyton verrucosum mainly affects farm workers in Japan, spreading in families and peaking in winter.
The study examined 58 cases of human ringworm caused by Trichophyton verrucosum in Japan, focusing on 39 epidemic cases in Iwate and 19 sporadic cases in Miyagi and Yamagata. Most patients were farm workers or their families, with infections peaking in winter. Familial transmission was noted in 26 individuals across 11 families. Lesions commonly appeared on exposed body parts, with six clinical types identified, including a potentially new hyperkeratotic form. The fungus easily invaded hair follicles, causing deep lesions. Brain heart infusion agar was effective for isolating the fungus, which thrived at 37 °C. Oral griseofulvin was recommended for certain lesion types. Additional cases were reported in Hokkaido and southwestern Japan.
