Lesson 16 Flashcards
formed in cultures and used for identification
Macroconidia
resistant infectious form shed from infected animals
Arthrospores
arthrospores are released by
fragmentation of hyphae in
keratinized structures
obligate pathogens
Zoophilic and anthropophilic dermatophytes
saprophytes in soil
geophilic dermatophytes
Cause characteristic circular skin lesions termed
ringworm (dermatophytosis)
Zoophilic group
- Microsporum canis
- M. gallinae
- Trichophyton equinum
- T. mentaagrophytes
- T. verrucosum
Obverse, white to buff with bright
orange periphery; reverse, yellowish orange or yellowish brown
Microsporum canis
Obverse, buff to cinnamon with
white border and powdery;
reverse, buff to reddish brown
M. gypseum
Obverse, cream to tan and
powdery; reverse, reddish brown
M. nanum
Obverse, initially white and fluffy,
later buff and folded; reverse, yellow to dark reddish brown
trichophyton equinum
Obverse, cream–tan to buff and
powdery; reverse, buff–tan to
dark brown
T. mentagrophytes
Obverse, white, heaped and
velvety; reverse, white or pale
buff
T. verrucosum
T.verrucosum requires these 2 for growth
thiamine, inositol
urease positive
T. mentagrophytes
