DESCRIPTIONS OF MEDICAL FUNGI

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126 Descriptions of Medical Fungi Microsporum canis is a zoophilic dermatophyte of worldwide distribution and is a frequent cause of ringworm in humans, especially children. Invades hair, skin and rarely nails. Cats and dogs are the main sources of infection. Invaded hairs show an ectothrix infection and fluoresce a bright greenish-yellow under Wood’s ultra-violet light. RG-2 organism. Morphological Description: Colonies are flat, spreading, white to cream-coloured, with a dense cottony surface which may show some radial grooves. Colonies usually have a bright golden yellow to brownish yellow reverse pigment, but non-pigmented strains may also occur. Macroconidia are typically spindle-shaped with 5-15 cells, verrucose, thick-walled and often have a terminal knob, 35-110 x 12-25 µm. A few pyriform to clavate microconidia are also present. Macroconidia and/or microconidia are often not produced on primary isolation media and it is recommended that subcultures be made onto lactritmel agar and/or boiled polished rice grains to stimulate sporulation. Confirmatory Tests: Microsporum canis Bodin Growth on Rice Grains: good growth of white aerial mycelium with production of yellow pigment. Microscopy reveals numerous macroconidia and microconidia similar to those described above. Reverse Pigment on Potato Dextrose Agar: Bright yellow (both M. audouinii and M. canis var. equinum are salmon to pinkish-brown). Vitamin Free Agar (Trichophyton Agar No.1): Good growth indicating no special nutritional requirements. Cultures are flat, white, suede-like to downy, with a yellow to pale yellow-brown reverse. Hair Perforation Test: Positive at 14 days. Key Features: Distinctive macroconidia and culture characteristics. Abundant growth and sporulation on polished rice grains and in vitro perforation of hair. Microsporum canis culture showing a bright golden yellow reverse pigment
Descriptions of Medical Fungi 127 Microsporum canis Bodin 20 µm Microsporum canis typical spindle-shaped macroconidia. Microsporum canis dysgonic strains are rare but may also occur. These dysgonic strains typically have a heaped and folded, yellow-brown thallus and macroconidia are usually absent. However, typical colonies and macroconidia of M. canis are usually produced by this variant when subcultured onto polished rice grains. Note: The dysgonic type colony of M. canis is similar to that of Microsporum ferrugineum.
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DESCRIPTIONS OF MEDICAL FUNGI

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