90. Imperfect yeasts and dimorphic fungi (genera, species).

Question 1

Dimorphic Fungi?

Answer 1

DIMORPHIC FUNGI
•yeast form in the host, mould form on media or
environment
•genera
•Histoplasma
•Sporothrix
•Coccidioides
•Blastomyces

Question 2

Histoplasma?

Answer 2

HISTOPLASMA
•tropics, Mediterranean area
•H. farciminosum: soil,
equine epizootic lymphangitis
•H. capsulatum: systemic (respiratory)
mycosis: human, dog, cat

Question 3

Sporothrix?

Answer 3

SPOROTHRIX
•S. schenckii: saprophyte on vegetation,
horse, dog, cat, human:
subcutaneus granulomatosis (sporotrichosis)

Question 4

Coccidioides?

Answer 4

COCCIDIOIDES
•C. immitis: soil, systemic mycosis dog,
horse, cat, human, lung

Question 5

Blastomyces?

Answer 5

BLASTOMYCES
•B. dermatitidis: soil, human, dog
blastomycosis (granulomatosis)

Question 6

Imperfect yeasts?

Answer 6

MALASSEZIA

CRYPTOCOCCUS

Candida

Question 7

Candida?

Answer 7

CANDIDA
No sexual reproduction, reproduce by forming blastospores, pseudohyphae and septate hyphae
C. albicans: human, piglet, calf, poultry commensals on mucous membranes
C. guillermondi: cattle genital mucous membranes
C. tropicalis
C. krusei

Question 8

Cryptococcus?

Answer 8

CRYPTOCOCCUS
C. neoformans: large mucopolysaccharide capsule produced, mucoid colonies, infection derived from the environment
mastitis (cattle, goat)
localized granuloma formation, systemic mycosis (cats, dogs, horses, cattle)

Question 9

Malassezia?

Answer 9

MALASSEZIA
M. pachydermatis: bottle-shaped cells, commensals on the skin,
dog, cat: dermatitis, external otitis