Question 1

Which of the following statements best explains why mycoses are among the most difficult diseases to diagnose and treat?

Accepted Answer

Signs of mycoses are often misinterpreted and fungi are frequently resistant to antimicrobial agents.

Question 2

A patient develops a fungal infection after receiving a heart valve implant. Which factor from Table 22.1 most likely predisposed this patient to an opportunistic mycosis?

Accepted Answer

Medical procedures such as surgery and insertion of medical implants

Question 3

Which of the following fungi is considered a true pathogen and is endemic primarily in the Americas?

Accepted Answer

Histoplasma capsulatum

Question 4

A laboratory technician is exposed to fungal spores while working with soil samples. Which route of infection is most likely for systemic mycoses caused by pathogenic fungi?

Accepted Answer

Inhalation of fungal spores

Question 5

Which antifungal drug is considered the gold standard for treating systemic mycoses?

Accepted Answer

Amphotericin B

Question 6

A patient with AIDS presents with pneumonia. The presence of cysts in lung tissue is almost diagnostic for which opportunistic fungal infection?

Accepted Answer

Pneumocystis pneumonia caused by Pneumocystis jirovecii

Question 7

Which of the following best describes the dimorphic nature of the four pathogenic fungi of the division Ascomycota?

Accepted Answer

They grow as molds in the environment and as spherical yeasts in the body.

Question 8

Aflatoxins, produced by certain fungi, are best known for which of the following effects?

Accepted Answer

Being carcinogenic and causing liver damage when consumed continuously at low levels

Question 9

Which of the following is a major exception to the general rule that most mycoses are not contagious?

Accepted Answer

Dermatophytes

Question 10

A patient presents with depigmented patches of scaly skin. Microscopic examination reveals budding yeast and short hyphal forms. Which organism is most likely responsible?

Accepted Answer

Malassezia furfur

Question 11

Which of the following best explains why fungal vaccines have been difficult to develop?

Accepted Answer

Natural immunity to fungi is rare and most patients with severe infections have suppressed immunity.

Question 12

A patient develops painless lesions on the face and upper body after working in soil rich in organic matter in the southeastern United States. Which fungal pathogen is most likely responsible?

Accepted Answer

Blastomyces dermatitidis

Question 13

Which of the following equations best represents the calculation of fungal growth rate ($$r) $$given the initial population ($$N_0$$), final population ($$N_t$$), and time ($$t$$)?

Accepted Answer

$$r = \frac{N_t - N_0$}{t}$$

Question 14

A patient with a history of leukemia develops a rapidly progressing fungal infection after receiving immunosuppressive therapy. Which two factors from Table 22.1 most likely contributed to this opportunistic mycosis?

Accepted Answer

Medical therapies and disease conditions

Question 15

Which of the following fungi is most commonly associated with allergies and can also cause invasive pulmonary disease?

Accepted Answer

Aspergillus species

Question 16

A patient presents with nodular lesions on the arm after being pricked by a thorn while gardening. The lesions follow the lymphatic vessels. Which fungus is most likely responsible?

Accepted Answer

Sporothrix schenckii

Question 17

Which of the following best describes the pathogenesis of Histoplasma capsulatum after inhalation of spores?

Accepted Answer

Spores are phagocytized by macrophages in the lungs and disseminate via the blood.

Question 18

Which of the following is a common clinical manifestation of dermatophytoses?

Accepted Answer

Ringworm (tinea)

Question 19

A patient presents with cryptococcal meningitis. Which characteristic of Cryptococcus neoformans enhances its pathogenicity?

Accepted Answer

Ability to resist phagocytosis due to its capsule

Question 20

Which of the following best describes the difference between mycotoxicosis and mycetismus?

Accepted Answer

Mycotoxicosis is caused by eating mycotoxins produced by fungi, while mycetismus is mushroom poisoning from eating a fungus.

Medical Mycology: Pathogenic Fungi and Fungal Diseases

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