Cryptococcus
Pigeon droppings are the environmental reservoir for *Cryptococcus neoformans*
What our notes say
- Pigeon droppings are the environmental reservoir for *Cryptococcus neoformans* (Medical Microbiology III Exam: Viruses, Fungi & Diagnosis)
- Confirmed by microscopic observation of oval yeast cells and pseudohyphae in CSF — this is *Candida*, not Cryptococcus — know the difference (High-Yield Medical Mycology: Top CAT Exam Questions & Drugs)
- *Cryptococcus neoformans* (its teleomorph/sexual form is *Filobasidiella neoformans*, a basidiomycete; pigeon droppings are the environmental reservoir) (Medical Mycology Q&A Section A.. )
- Opportunistic mycoses — infect immunocompromised patients; caused by organisms like Candida, Aspergillus, Cryptococcus (MEDICAL MYCOLOGY — LONG ANSWER QUESTIONS)
- Mucicarmine — mucin; confirms mucin-producing adenocarcinomas and stains *Cryptococcus* capsule (Pathology Practical Revision Guide)
- Associated with pigeon droppings → *Cryptococcus neoformans* (Mycology Revision: Fungal Infections, Histoplasmosis & Cryptococcosis)
Study material on Cryptococcus
- Medical Virology: Adenoviruses, Hemorrhagic Fever & Viral Receptors
- 📚 MEDICAL VIROLOGY & MYCOLOGY — MCQ BANK
- Medical Microbiology III Exam: Viruses, Fungi & Diagnosis
- Master Medical Mycology: MKU Exam Guide for Fungal Diseases
- MYCOLOGY MCQs — Complete Bank
- MEDICAL MYCOLOGY — LONG ANSWER QUESTIONS
- Medical Virology & Mycology Paper Two 2022/2023 — MKU MBMM 3300 Questions & Answers
- Mycology Revision: Fungal Infections, Histoplasmosis & Cryptococcosis
- Medical Mycology Q&A Section A..
- Pharmco Notes
- Medical Mycology Q&A: Fungal Pathogens, Drugs, & Diseases
- Weekly Year 3: Medical Mycology Exam - October 2, 2026 (Sections B & C)
- Medical Virology & Mycology Paper Two 2022/2023 — MKU MBMM 3300 MCQs with Answers
- Virology 3
Practice questions on Cryptococcus
Each of the following statements concerning Cryptococcus neoformans is correct EXCEPT:
- It is a yeast that typically reproduces by budding.
- It has a prominent polysaccharide capsule.
- It is a common cause of pneumonia in immunocompetent individuals.
- It can cause meningoencephalitis in immunocompromised hosts.
Answer: C. While Cryptococcus neoformans can cause pneumonia, it is much more common and severe in immunocompromised individuals than in immunocompetent ones. It is well-known for causing meningoencephalitis in this patient population due to its ability to cross the blood-brain barrier and its prominent capsule, which aids in immune evasion.
Each of the following statements concerning Cryptococcus neoformans is correct EXCEPT:
- It is a yeast with a polysaccharide capsule.
- It is commonly found in bird droppings.
- It causes blastomycosis.
- It can cause meningoencephalitis, particularly in immunocompromised individuals.
Answer: C. Cryptococcus neoformans causes cryptococcosis, not blastomycosis. Blastomycosis is caused by Blastomyces dermatitidis. C. neoformans is indeed a yeast with a prominent polysaccharide capsule, found in bird droppings, and can cause severe meningoencephalitis.
Each of the following statements concerning Cryptococcus neoformans is correct EXCEPT:
- It is a yeast that reproduces by budding.
- It is encapsulated, a key virulence factor.
- It is a common cause of meningitis in immunocompetent individuals.
- It is often found in bird droppings.
Answer: C. While Cryptococcus neoformans can cause meningitis in immunocompetent individuals, it is far more common and severe in immunocompromised patients (e.g., those with HIV/AIDS).
Each of the following statements concerning Cryptococcus neoformans is correct EXCEPT:
- It is a yeast that typically reproduces by budding.
- It has a prominent polysaccharide capsule.
- It is a common cause of pneumonia in immunocompromised individuals.
- It is typically treated with fluconazole alone for cryptococcal meningitis.
Answer: D. Cryptococcal meningitis is a serious infection that is usually treated with a combination of amphotericin B and flucytosine, followed by a consolidation phase with fluconazole. Fluconazole alone is often insufficient for initial treatment of meningitis.
Which statement about Cryptococcus neoformans is INCORRECT?
- Natural habitat is soil, especially pigeon droppings
- Budding yeasts are found in lesions
- The initial site of infection is usually the lung
- Pathogenesis is primarily due to exotoxin A
- All of the above
Answer: D. Cryptococcal virulence rests on its polysaccharide capsule; exotoxin A is a Pseudomonas toxin.
Each of the following statements concerning Cryptococcus neoformans is correct EXCEPT:
- It is an encapsulated yeast.
- It is commonly found in bird droppings.
- It is a common cause of pneumonia in immunocompetent individuals.
- It can cause meningitis.
Answer: C. While Cryptococcus neoformans can cause pneumonia, it is a significant opportunistic pathogen that primarily causes severe disease (like meningitis) in immunocompromised individuals.