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Opportunistic fungai
| Question | Answer |
|---|---|
| Dimorphic yeast. Pseudohyphae and budding yeasts at 20ºc Germ tubes at 37ºC | Candida Albicans |
| Aflatoxins associated with HCC | Aflatoxin B1, Aspergillus fumigatus |
| Associated with asthma or CF; may cause Bronchiectasis and Eosinophilia, Increased IgE | Aspergillus |
| Most common fungal meningitis of immunocompromised in US | Cryptococcus neoformans |
| Found in soil, pigeon droppings. Acquired through inhalation with hematogenous dissemination to meninges. | Cryptococcus neoformans |
| Culture on Sabouraud's agar. Stains with India ink. | Cryptococcus neoformans |
| Latex agglutination test detects polysaccharide capsular antigen and is more specific. | Cryptococcus neoformans |
| "Soap bubble" lesions in brain. | Cryptococcus neoformans |
| Rhinocerebral, frontal lobe abscesses. Headache, facial pain, black necrotic eschar on face; may have cranial nerve involvement | Mucor and Rhizopus spp. |
| Irregular, broad, nonseptate hyphae branching at wide angles | Mucor |
| Septate hyphae that branch at 45º angle | Aspergillus |
| Diffuse, bilateral CXR appearance. | Pneumocystis jirovecii |
| Diagnosed by lung biopsy or lavage. Disc-shaped yeast forms on methenamine silver stain of lung tissue | Pneumocystis jirovecii |
| Methenamine silver stain | Pneumocystis jirovecii |
| Cigar-shaped budding yeast | Sporothrix schenckii |
| Sporothrix schenckii treatment | Potassium iodide |
| "rose gardener's" disease | Sporothrix schenckii |
| Spores are traumatically introduced into the skin, typically by a thorn causes local pustule or ulcer with nodules along draining lymphatics (ascending lymphangitis). | Sporothrix schenckii |
| When to start prophylaxis for Pneumocystis jirovecii | CD4 drops < 200 cells/mm3 in HIV patients with Dapsone |