Block 9 Infxn Path Anaerobe & Mycology MCQ's

9 Questions | By Chachelly | Last updated: Mar 21, 2022 | Total Attempts: 393

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Block 9 Infxn Path Anaerobe & Mycology MCQ

Infectious pathology, anaerobes, mycology

Questions and Answers

1.

Clostridium perfringens is notable for causing gas gangrene. Which other condition is this bacterium associated with?
- A.
  
  A) A life threatening diarrheat illness associated with Type A bacteria
- B.
  
  B) A self limiting, acute, diarrheal illness associated with Type C bacteria
- C.
  
  C) A sometimes fatal disease called enteritis necrotans associated with Type A bacteria
- D.
  
  D) A self limiting, acute, diarrheal illness associated with Type A bacteria
- E.
  
  E) A chronic, diarrheal illness associated with Type A bacteria
2.

A 52-year-old medical missionary has recently returned to the US from a tour in an emerging nation. She presents to her family physician with a complaint of a productive cough and some dyspnea. She says that this has been going on for some time, but she wanted to wait for medical care in the states. She has not history of smoking and rarely drinks alcohol. Physical exam reveals some lung consolidation on auscultation and a low grade fever. A chest x-ray reveals multifocal 1-3 cm nodules, a few being cavitated. Acid fast stains or the sputum reveal acid-fast organisms; however the results of cultures are yet to be determined. Which of the following is the Most Likely cause of the lung lesions?
- A.
  
  Fibrinous inflammation
- B.
  
  Granulomatous inflammation
- C.
  
  Serous inflammation
- D.
  
  Suppurative inflammation
- E.
  
  Pulmonary abscesses
3.

A pathologist receives a surgical specimen taken from a 12-year-old boy. The submitted history is not helpful. The specimen is processed for histopathology and the pathologist submits the following report. The specimen was one cm in diameter and nodular. The cut surface revealed a central region of white creamy material surrounded by a rim of firm tissue. Microscopically, the central region consisted of neutrophils, some of which were apoptotic. The neutrophils were surrounded by a capsule of proliferating granulation tissue. What is your diagnosis?
- A.
  
  Abscess
- B.
  
  Benign neoplasm
- C.
  
  Cellulitis
- D.
  
  Granuloma
- E.
  
  Infarct
4.

A 49-year-old woman has a high fever and a productive cough for 3 days. Her sputum is copious and yellow. Crackles are audible bilaterally at both lung bases and chest x-rays reveal patchy pulmonary infiltrates. Which of the following would most likely be found in greatest number in her sputum specimens?
- A.
  
  Eosinophils
- B.
  
  Neutrophils
- C.
  
  Fibroblasts
- D.
  
  Macrophages
- E.
  
  Mast cells
5.

A patient is scheduled to have a chronic abscess incised and drained. What would you expect microscopic examination of the contents of the abscess to most likely show?
- A.
  
  A chronic inflammatory infiltrate of lymphocytes and macrophages
- B.
  
  An area of liquefactive necrosis
- C.
  
  A chronic inflammatory infiltrate of neutrophils, lymphocytes, macrophages & plasma cells
- D.
  
  An acute inflammatory infiltrate of primarily neutrophils
- E.
  
  A chronic inflammatory infiltrate of primarily neutrophils
6.

A severely neutropenic transplant has died from pulmonary hemorrhage due to hyphae invading the pulmonary blood vessels resulting in infarct and major hemorrhage. Which of these fungi could do this?
- A.
  
  Blastornyces
- B.
  
  Aspergillus
- C.
  
  Sporothrix
- D.
  
  Histoplasma
- E.
  
  Cocciclioides
7.

Which description below best describes colorless fungal fiaments?
- A.
  
  Oval budding cel!s
- B.
  
  Derrnatophytic pseuciohyphae
- C.
  
  Dimorphic fungi
- D.
  
  Hyaline hyphae
- E.
  
  Clernatiaceous hyphae
- F.
  
  Luminescent trophozoites
8.

A 45-year old man from Missouri was referred to the hospital with a 3-week history of fever, cough, shortness of breath and fatigue. The patient has been diagnosed with AIDS S years previously. A routine direct examination of a blood smear is shown below. Which of the following is the growth form of the most probable causative pathogen?
- A.
  
  A thermally dimorphic fungus, mould form at 37°C (99°F), and in yeast form at 25°C (77°F)
- B.
  
  A thermally dimorphic fungus, mould form at 25°C (77°F) and yeast form at 37°C (99°F)
- C.
  
  A polymorphic yeast, producing yeast cells, hyphae and pseudohyphae
- D.
  
  A monomorphic sporocarp
- E.
  
  A dimorphic sporocarp
9.

Clostridium difficile is an important cause of nosocomiai diarrhea and disease in C. difficile colitis is mediated by toxins produced by the organism. Which type of laboratory test would be the most rapid and efficient way of confirmng infection with this organism?
- A.
  
  Cultivation of the microbe on semi-solid media
- B.
  
  Detection of the patient's immune response against the organism
- C.
  
  Cultivation of the microbe in cell lines
- D.
  
  Detection of the toxin produced by the organism
- E.
  
  Gram stain of specimen