The clinical presentation of tinea capitis in a child, combined with greenish-yellow fluorescence under Wood's lamp, is highly characteristic of infection by certain Microsporum species, particularly Microsporum canis. M. canis is a common zoophilic cause of tinea capitis and produces ectothrix infection with fluorescence. Trichophyton rubrum typically causes tinea pedis, tinea corporis, and onychomycosis, and does not fluoresce. Epidermophyton floccosum causes tinea cruris and tinea pedis, and also does not fluoresce. Candida albicans causes candidiasis, which has a different clinical presentation and does not fluoresce under Wood's lamp.
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