Fungal colony of Trichophyton rubrum, SEM

Fungal colony of Trichophyton rubrum, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph (SEM) of a fungal colony (mycelium) of Trichophyton rubrum. T. rubrum is an anthropophilic dermatophyte. Dermatophyte fungi infect keratinized tissues (skin, nails, hair) in humans and other animals. The downy strain of T. rubrum has become the most widely distributed dermatophyte of humans. It frequently causes chronic infections of skin, nails and rarely scalp. The thread-like structures are hyphae, the vegetative filamentous cells of this fungus. This hyphal stage is the saprophytic stage of the fungus. Fungal growth is usually confined to tips of hyphae, where asexual reproduction occurs by spore formation. Dermatophytes preferentially inhabit the nonliving, cornified layers of the skin, hair, and nail, which is attractive for its warm, moist environment conducive to fungal growth. Magnification: x35 when shortest axis printed at 25 millimetres.

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