OPPORTUNISTIC SAPROBIC FUNGI AND FUNGAL CONTAMINANTS Flashcards
diseases of Aspergillus spp
- Aspergillosis
- External otomycosis (fungus ball of external auditory canal)
- Mycotic keratitis
- Onychomycosis
- Fungus ball in chest X-ray
- Aflatoxin
food poisoning caused by Aspergillus spp
aflatoxin
most frequently isolated;
pulmonary, eye, CNS, and systemic infections
Aspergillus fumigatus
A. fumigatus colony
white to blue green.
A. niger
black
A. flavus
yellow to green
A. terreus
tan to cinnamon
Branching, septate hyphae that terminate in a conidiophore, which
expands into a large, spherical vesicle.
Vesicle is covered with sterigmata (stalks), and parallel chains of conidia
cover the sterigmata
Aspergillus spp.
Spx Aspergillus spp
sputum, aspirate (microscopy, MRI/CT, Xray)
Widespread in nature
Rhinocerebral mucormycosis, vascular
invasion, thrombosis, and necrosis.
Zygomycetes
Large, broad, nonseptate
hyphae that produce horizontal runners, or stolons, which attach at
contact points by rootlike structures, or rhizoids. Sporangiophores arise in
clusters at rhizoids and terminate in sporangia.
Rhizopus
: Similar to Rhizopus; however,
sporangiophores arise between nodes,
from which rhizoids are formed
Absidia
no rhizoids (no root like structure)
MUCOR
Zygomycetes spx
tissue aspirate, microscopy
Dimorsphic fungi
Blastomyces, Histoplasma, Coccidioides, Paracoccidioides, Sporothrix, Penicillium/Talaromyces, Emmonsia
