What is the primary difference between a pathogenic and a commensal fungus?
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Overview of pathogenic fungi, fungal infections, and their diagnosis and treatment.
Mastering this deck enables healthcare professionals to recognize, diagnose, and manage various fungal infections effectively, improving patient outcomes through informed choices of laboratory tests and antifungal therapies, as well as understanding the epidemiology of pathogenic fungi.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary difference between a pathogenic and a commensal fungus? | Pathogenic fungi cause disease in the host, especially in immunocompromised individuals, whereas commensal fungi coexist with the host without causing harm and may even provide benefits. | Think 'disease-causing' vs. 'harmless coexistence'. |
| 2 | Name three common pathogenic fungi responsible for human infections. | Histoplasma capsulatum, Cryptococcus neoformans, and Candida albicans. | Remember 'HCC' as an abbreviation for these pathogens. |
| 3 | What is the most common clinical manifestation of Candida albicans infection? | Oropharyngeal or esophageal candidiasis, often presenting as white plaques in the mouth or throat. | Think 'thrush' for Candida. |
| 4 | Which fungal infection is associated with bird droppings and soil contaminated with bird feces? | Histoplasmosis, caused by Histoplasma capsulatum. | Histoplasma loves 'histo' (tissues) and bird droppings. |
| 5 | What is the typical laboratory diagnosis method for Cryptococcus neoformans? | India ink stain revealing the capsule or cryptococcal antigen detection in serum or CSF. | Think 'capsule' and 'antigen testing'. |
| 6 | Which fungal infection is most common in immunocompromised patients and can cause meningitis? | Cryptococcal meningitis caused by Cryptococcus neoformans. | Remember 'crypt' as in hiding, referring to its capsule. |
| 7 | Name two fungi responsible for dermatophyte infections. | Trichophyton species and Microsporum species. | Dermatophytes 'trick' the skin, hair, and nails. |
| 8 | What is the primary mode of transmission for dermatophyte infections? | Direct contact with infected skin, hair, or nails, or contact with contaminated fomites. | Fungal 'footwear' or 'pets' can be sources. |
| 9 | Which antifungal drug is commonly used to treat systemic candidiasis? | Fluconazole or echinocandins like caspofungin. | Think 'flu' for fluconazole; 'casp' for caspofungin. |
| 10 | What is the main feature of Aspergillus species that aids in diagnosis? | Presence of septate hyphae with acute angle (45 degrees) branching in tissue samples. | Remember 'A' for Aspergillus and angled hyphae. |
| 11 | Which fungal pathogen is a common cause of cryptococcal meningitis in AIDS patients? | Cryptococcus neoformans. | Cryptococcus loves 'neuro' tissues—causes meningitis. |
| 12 | What is the typical environmental source of Pneumocystis jirovecii, causing Pneumocystis pneumonia? | It is thought to be acquired from the environment; it is not considered a typical soil fungus but is a member of fungi that colonize humans. | Remember it's a 'pneumocystis' of the lungs, not soil. |
| 13 | Which diagnostic method is most sensitive for detecting Pneumocystis jirovecii? | Induced sputum or bronchoalveolar lavage with silver stain or immunofluorescence assay. | Think 'special stains' for this tricky pathogen. |
| 14 | What is the main mechanism of action of amphotericin B? | It binds to ergosterol in fungal cell membranes, creating pores and causing cell death. | Target 'ergosterol', the fungal equivalent of cholesterol. |
| 15 | Which class of antifungal agents inhibits fungal cell wall synthesis? | Echinocandins (e.g., caspofungin, micafungin). | Echinocandins 'build walls' by inhibiting beta-glucan synthesis. |
| 16 | What are common risk factors for developing fungal infections? | Immunosuppression (e.g., HIV/AIDS, chemotherapy), broad-spectrum antibiotics, indwelling catheters, and diabetes mellitus. | Think 'immuno' and 'devices' as risk enhancers. |
| 17 | Name an antifungal agent effective against dermatophyte infections. | Terbinafine or griseofulvin. | Terbinafine is a 'top' choice for skin fungal infections. |
| 18 | Which fungal species is associated with causing mucormycosis, especially in diabetics? | Rhizopus species. | Remember 'R' for Rhizopus and 'R' for 'rampant' invasive infection. |
| 19 | What is the hallmark histopathological feature of mucormycosis? | Broad, aseptate hyphae with right-angle branching. | Think 'broad' and 'no septa' for Mucor. |
| 20 | What is the main approach to diagnosing fungal infections in the lab? | Microscopy with special stains, culture on fungal media, and antigen or molecular testing. | Combine 'look, grow, detect' for diagnosis. |
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