What are Macroconidia and Microconidia?
Relatively large and complex conidia are termed macroconidia while the smaller and more simple conidia are termed microconidia. The presence/absence of conidia and their size, shape and location are major features used in the laboratory to identify the species of fungus in clinical specimens.
Is ringworm a Microsporum?
Approximately 40 different species of fungi can cause ringworm; the scientific names for the types of fungi that cause ringworm are Trichophyton, Microsporum, and Epidermophyton.
Is Microsporum canis the same as ringworm?
The three most common fungal species that may cause ringworm in dogs are Microsporum canis, Microsporum gypseum and Trichophyton mentagrophytes. These three species of ringworm are zoonotic, meaning they can also infect humans.
Is Microsporum a yeast?
Microsporum is a genus of fungi that causes tinea capitis, tinea corporis, ringworm, and other dermatophytoses (fungal infections of the skin)….
| Microsporum | |
|---|---|
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Eurotiomycetes |
| Order: | Onygenales |
What is Trichophyton Microsporum?
Trichophyton rubrum is the most common anthropophilic dermatophyte worldwide and its typical infection areas include skin of hands or feet and nail plate. In turn, Microsporum canis is a zoophilic pathogen, and mostly well known for ringworm in pets, it is also known to infect humans.
What is a Pseudohyphae?
Pseudohyphae are a distinct growth form that differs from both yeast cells and parallel-sided hyphae and are characterized by synchronously dividing elongated yeast cells (5, 7, 41, 42).
What does Microsporum look like on dextrose agar?
Microsporum canis grows rapidly and the diameter of the colony reaches 3 to 9 cm following incubation at 25°C for 7 days on Sabouraud dextrose agar. The texture is woolly to cottony and flat to sparsely grooved. The color is white to yellowish from the front and deep yellow to yellow-orange from the reverse.
How to distinguish Microsporum canis from other species?
In addition, M. canis exhibits rapid colony growth at 25 °C. Two growth media that help distinguish M. canis from other Microsporum spp. (notably the morphologically similar species, M. audouinii) – specifically polished rice and potato dextrose agar. A fungal infection rarely spreads below the surface of the skin to cause serious illness.
What is the distribution of Microsporum species?
Some species are isolated from both soil and animals (geophilic and zoophilic). Most of the Microsporum spp. are widely distributed in the world while some have restricted geographic distribution.
How did Microsporum canis evolve?
Microsporum canis evolved as a result of host-specific interactions, changes in ecological niche, as well as, geographic isolation of + and – mating types of Arthroderma otae, hence making it difficult to sustain sexual reproduction. Microsporum canis generally invades hair and skin; however, some nail infections have been reported.