Cutaneous Mycoses

Question 1

Dermatophytosis

Answer 1

infection caused by a dermatophyte or ringworm fungi in the keratinized tissues

Question 2

dermatomycoses

Answer 2

yeasts and normally saprophytic filamentous fungi cause cutaneous infections resembling dematophytoses

Question 3

Anthropophillic dermatophytes- Human reservoir

Answer 3

• Epidermophyton floccosum

- Trichophyton rubrum, T. schonelieinii, T. tonsurans, T. violaceum

Question 4

Zoophilic dermatophytes- Animal resrvoir

Answer 4

• Microsprum canis, M. equinum, M. gallinae,

- Trichophyton mentagrophytes, T. simii, T. verrucosum

Question 5

Geophillic dermatophytes- soil reservoir

Answer 5

-Microsporum gypseum, N. nanum, M. persicolor, M. vanbreuseghemii, M. cookei

Question 6

Microsporum

Answer 6

-these species attack hair and skin

Question 7

what is the most common dermatophyte of domestic animals?

Answer 7

Microsproum Canis

Question 8

trichophyton

Answer 8

attack both hair, skin, nails, horns, and claws

Question 9

Clinical signs of dermatophytosis

Answer 9

• very with infecting strain and immune status of host

- characterized by: alopecia, erythema, scaling, crusting, annular ringed lesions, and vesicles or papules

Question 10

Infection caused by ______ spp. are usually more severe than those caused by _____ spp. because more inflmmation is associated with the former.

Answer 10

• Trichophyton

- Microsporum

Question 11

Infection by ___ leads to intense inflammation(kerion)-swelling, ulceration and purulent exudation

Answer 11

T. mentagrophytes

Question 12

Feline otitis caused by ____ is characterized by a persistent waxy, ceruminous otic discharge

Answer 12

Microsporum canis

Question 13

bovine ring worm is caused by

Answer 13

Trichophyton verrucosum

Question 14

Porcine ringworm is caused by

Answer 14

Microsporum nanum, M gypseum, M. canis and T. mentagrophytes

Question 15

Equine ring worm is caused by:

Answer 15

Trichophyton equinum and M. gypseum

Question 16

poultry ring worm is caused by:

Answer 16

M. gallinae

Question 17

what are the two major classes of antigens

Answer 17

• glycopeptides

- kertinases

Question 18

Glucopeptides

Answer 18

stimulate cell-mediated and humoral immunity

Question 19

kertinases

Answer 19

-elicit delayed -type hypersensitivity responses

Question 20

Dermatophyte Test Medium (DTM)

Answer 20

• Sabouraud’s dextrose agar
• pH indicator
• growth with red slant before 10 day indicates a dermatophyte

Question 21

what are the two types of dermatophytes that are likely to infect people?

Answer 21

• M. canic

- T. verrucosum

Question 22

Examples of Dermatomycoses

Answer 22

• Malassezia
• Trichosporon spp.
• Geotrichum candidum

Question 23

Malassezia species

Answer 23

• these lipophilic yeast are member of the normal cutaneous flora of animals and are opportunistic pathogens
• M. pachydermatis*
• M. nana

Question 24

In dogs M. pachydermatis causes:

Answer 24

• Otitis externa

- Seborrheic dermatitis

Question 25

the most useful tool for diagnosis of Malassezia infection is

Answer 25

cytologic exam of affected areas

Question 26

____ is an emerging zoonotic pathogen.

Answer 26

Malassezia pachydermatitis

Question 27

Prichosporon beigelii

Answer 27

• Piedra- infection of hair shaft

- characterized by formation of small whit to light brown nodules that appear on the hair of the mane and tail (rarely)

Question 28

Trichosporon pullalans

Answer 28

-nasal mass in cats

Question 29

Geotrichum candidum

Answer 29

• ubiquitous saprophyte of soil and decaying organic matter
• is common in reptiles and amphibians
• cutaneous lesions consist of discrete, nodular, well circumscribed dermoepidermal masses