* 1 Species and their habitat preference * 2 Effect on humans * 3 References * 4 External links
SPECIES AND THEIR HABITAT PREFERENCE
Geophilic fungi prefer to live in soil.
Anthropophilic fungi prefer
to infect humans.
Zoophilic fungi prefer to infect animals other than
humans. Cats can pass on
Trichophyton ajelloi geophilic
Trichophyton concentricum anthropophilic
Trichophyton equinum zoophilic (horse)
Trichophyton mentagrophytes var. erinacei zoophilic (hedgehog)
Trichophyton mentagrophytes var. interdigitale anthropophilic
Trichophyton schoenleinii anthropophilic
Trichophyton soudanense anthropophilic
Trichophyton tonsurans anthropophilic
Trichophyton verrucosum zoophilic (cattle, horse)
Trichophyton violaceum anthropophilic
Trichophyton yaoundei anthropophilic
EFFECT ON HUMANS
The anthropophilic varieties cause forms of dermatophytosis , that is, fungal infection of the skin. They are keratinophilic: they feed on the keratin in nails, hair, and dead skin.
Trichophyton concentricum causes "Malabar itch", a skin infection consisting of an eruption of a number of concentric rings of overlapping scales forming papulosquamous patches.
They can be transmitted by direct contact, by contact with infested particles (of dead skin, nails, hair) shed by the host, and by contact with the fungi's spores . These fungi thrive in warm moist dark environments, such as in the dead upper layers of skin between the toes of a sweaty foot inside a tightly enclosed shoe, or in dead skin particles on the wet floor of a communal (shared) shower. Their spores are extremely difficult to eliminate, and spread everywhere.
When the hyphae of the fungi burrow into the skin and release enzymes to digest keratin, they may irritate nerve endings and cause the host to itch , which may elicit the scratch reflex , which directs the host to scratch. Scratching directly transfers fungi and dead skin particles that are infested with the fungi to the fingers and under the finger nails. From there they can be transmitted to other parts of the host's body when the host touches or scratches those. Scratching also damages skin layers, making it easier for the fungi to spread at the site of the infection. If the fungi and infested debris are not washed from the fingers and fingernails soon enough, the fungi can also infect the skin of the fingers (tinea manuum ), and burrow underneath and into the material of the fingernails (tinea unguium ). If left untreated, the fungi continue to grow and spread.
* ^ "
Ringworm - Healthy Pets Healthy People". Centers for Disease
Control and Prevention. April 30, 2014. Retrieved 21 June 2017. This
article incorporates public domain material from websites or documents
Centers for Disease Control and Prevention