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Trichophyton verrucosum : ウィキペディア英語版 | Trichophyton verrucosum
''Trichophyton verrucosum'', commonly known as the cattle ringworm fungus, is a dermatophytic largely responsible for fungal skin disease in cattle, but is also the a common cause of ringworm in donkeys, dogs, goat, sheep, and horses. It has a worldwide distribution, however human infection is more common in rural areas where contact with animals is more frequent, and can cause severe inflammation of the afflicted region.〔 ''Trichophyton verrucosum'' was first described by Emile Bodin in 1902. ==Growth and morphology== ''Trichophyton verrucosum'' is very slow-growing compared to other dermatophytes. In culture, it is characterized by being flat, white/cream colour, having an occasional dome, with a glabrous texture, known as the variant ''album'', however other variations are also found: ''T. verrucosum'' var. ''ochraceum'' has a flat, yellow, glabrous colony; ''T. verrucosum'' var. ''discoides'' has a gray-white, flat, and tomentose colony; and ''T. verrucosum'' var. ''autotrophicum'' is rarely seen and is associated with sheep. Under a microscope, macronidia are rare, and have a rat-tail or string bean shape, while micronidia are tear-shaped and have been only observed in laboratories when grown under enriched conditions. It lacks a teleomorph (sexual) stage. At 37 C (the only dermatophyte with an optimum growth temperature this high),〔 chlamydospores become thick-walled and found in long chains.〔 Macronidia are more commonly produced on BCP-milk solids-yeast extract agar, and only on colonies over 7 days old. Under refrigeration, it will die.〔 Regions infected with ''T. verrucosum'' will fluoresce under a blacklight in cattle, but not in humans.〔
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