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MycologyOpportunistic Molds
Division of Medical Technology
Carol Larson MSEd, MT(ASCP)
Please click audio iconto hear Carol’s narration
Basic Characteristics
• Rapid growers (4-5 days)
• Found in soil (saprobic)
• Conidia are airborne
• Opportunistic pathogens
• Treatment
Click icon for audio
Opportunistic Mold Classification
• Aseptate (sparsely septate) / hyaline
• Septate / dematiaceous
• Septate / hyaline
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Zygomycetes
• Lid lifters
• Sporangiospores
• Rhizoids
Aseptate (sparsely septate) hyaline hyphaeClick icon for audio
Clinical Significance
• Causes Zygomycosis (Mucormycosis, Phycomycosis)
• Predisposition– Diabetics– Malnutrition– Immunosuppressed– Prolonged antibiotic therapy
• Pathogenesis– Nasal sinuses– Migrate to brain and meninges
Aseptate (sparsely septate) hyaline hyphaeClick icon for audio
Absidia species
• Internodal rhizoids
Aseptate (sparsely septate) hyaline hyphaeClick icon for audio
In Review …
• Aseptate (sparsely septate) hyaline hyphae
• Zygomycetes– Lid lifters, sporangiospores– Absidia – internodal rhizoids– Mucor – no rhizoids– Rhizopus – nodal rhizoids
• Zygomycosis
Aseptate (sparsely septate) hyaline hyphaeClick icon for audio
Opportunistic Mold Classification
• Aseptate (sparsely septate) / hyaline
• Septate / dematiaceous
• Septate / hyaline
Click icon for audio
Alternaria species
• Colony morphology:
• Microscopic morphology:
Septate / dematiaceous hyphaeClick icon for audio
Cladosporium species
• Colony morphology:
• Microscopic morphology:
Septate / dematiaceous hyphaeClick icon for audio
In Review …
• Septate, dematiaceous hyphae
• Alternaria species
• Cladosporium species
• Generally nonpathogenic
Septate / dematiaceous hyphaeClick icon for audio
Opportunistic Mold Classification
• Aseptate (sparsely septate) / hyaline
• Septate / dematiaceous
• Septate / hyaline
Click icon for audio
Aspergillus species
• Causes Aspergillosis
• Predisposed– Debilitated & immunocompromised
• Pathogenesis– Inhale conidia– Pulmonary disease– Systemic
Septate / hyaline hyphaeClick icon for audio
Aspergillus fumigatus
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
Aspergillus niger
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
Aspergillus flavus
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
Aspergillus species
• Colony morphology:– Velvety, white, green
yellow, cinnamon brown, reverse varies
• Microscopic morphology:– Single or double row of
phialides covering entire vesicle
Septate / hyaline hyphaeClick icon for audio
In Review …
• Aspergillus species– A. fumigatus– A. niger– A. flavus– Many others
• Aspergillosis
Septate / hyaline hyphaeClick icon for audio
Other Opportunistic Molds
• Penicillium species
• Paecilomyces species
• Fusarium species
• Sepedonium species
Septate / hyaline hyphaeClick icon for audio
Penicillium species
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
Paecilomyces species
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
Fusarium species
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
Sepedonium species
• Colony morphology:
• Microscopic morphology:
Septate / hyaline hyphaeClick icon for audio
In Review …
• Septate hyaline hyphae
• Opportunistic pathogens– Aspergillus– Fusarium
• Lab contaminants– Penicillium– Paecilomyces– Sepedonium
Septate / hyaline hyphaeClick icon for audio
In Summary …
• Key characteristics
• Identification methods– Colony morphology– Microscopic morphology
• Clinically significant opportunistic molds– Zygomycetes– Aspergillus fumigatus, A. niger, A. flavus– Fusarium species
Opportunistic MoldsClick icon for audio