Microscopic Examination of Fungi Quiz

Study Notes

Cutaneous Mycoses Characteristics

Tinea infections are characterized by the site of infection, e.g., Tinea capitis (Ringworm in the head)
Dermatophyte infections are keratinophilic, meaning they love keratin, a protein found in hair, nails, and skin
Dermatophytes can be found in soil, animals, and humans

Agents of Cutaneous Mycoses

Trichophyton, Microsporum, and Epidermophyton are fungal genera that can cause cutaneous mycoses
Each genus can cause multiple infections and one site can be infected with multiple species
Trichophyton rubrum and Epidermophyton floccosum are frequently associated with Tinea corporis

Trichophyton Agents

Trichophyton infects skin, hair, and nails
Macroconidia are pencil/cigar-shaped, smooth-walled, and clavate/peg-shaped/teardrop
Microconidia are none

Microsporum Spp

Description: Microsporum have no microconidia
Macroconidia are spindle-shaped with rough walls
Wood's light: yellow-green fluorescence
Hyphae: antler and racquet hyphae with terminal chlamydospore

Microscopic Exam

Rhizoid or racquet, hyaline, septate hyphae with alternate arthroconidia (mold form)
Arthroconidia are separated by clear or lighter staining nonviable cells

Opportunistic Mycoses

Opportunistic mycoses can cause infection when the immune system is low
Not categorized according to site, can be systemic, cutaneous, subcutaneous, or superficial

Order Mucorales

Cunninghamella spp, Lichtheimia spp, Mucor spp, Rhizopus spp, and Syncephalastrum spp are members of Order Mucorales
Each genus has distinct characteristics and can cause specific diseases

Cunninghamella Spp

Macroscopic examination: White to gray cottony colonies, branching sporangiophores with sporangioles
Recovered from sinuses or other organs during disseminated disease

Rhizopus Spp

Macroscopic examination: White to gray and brown woolly colonies, dark and fragile sporangia
Umbrella-shaped structure upon rupture of the sac
Microscopic examination: Microscopic examination of Rhizopus spp

Paecilomyces Lilacinus / Paecilomyces Spp

Macroscopic examination: Tan, brownish gold, or mauve flat, granular to velvety colonies
Microscopic examination: Spindle-shaped conidia

Penicillium Spp

Macroscopic examination: Light pinks, gray, tan pigmented colonies
Microscopic examination: Simple, wide-based, single-celled conidia, arthroconidia

Chrysosporium Spp

Macroscopic examination: Green or blue-green colonies, loose chain ovoid conidia
Microscopic examination: Brush-like conidia

Scopulariopsis Spp

Macroscopic examination: Off-white to pink and black colonies, arthroconidia
Specimen Collection: nail specimens

Chaetomium Spp

Macroscopic examination: Tan to buff colonies
Microscopic examination: Truncate-based conidia

Trichodermas Spp

Microscopic examination: Characteristics of Trichodermas Spp

Description

Test your knowledge on identifying fungi through microscopic examination. Questions cover topics like rhizoid or racquet, hyaline, septate hyphae with arthroconidia, and identifying different types of hyphae. Perfect for students or professionals in microbiology or mycology.

Microscopic Examination of Fungi Quiz

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Questions and Answers

Which genus of virus is associated with localized skin nodules in humans?

What is the primary host of Cowpox virus?

Which virus is known for causing a generalized disease in humans?

Which form of POXVIRUSES is found in vesicular fluids?

Which virus has been eliminated and was associated with causing Smallpox in humans?

Which POXVIRIDAE genus is associated with a virus that resembles a mulberry fruit under an electron microscope?

'Yabapox' infections are very rare and accidental in humans; which host does this virus primarily infect?

'Pseudocowpox' primarily causes which disease in cows?

'Tanapox' infections in humans are rare and localized; which animals does this virus primarily infect?

'Molluscum contagiosum' virus belongs to which genus of POXVIRIDAE?