Microbiology Quiz #18, Nocardia and Actinomyces 

1. A 45-year-old man, with a history of chronic obstructive pulmonary disease (COPD), presents to the clinic with a 2-week history of cough, fever, and weight loss. Chest X-ray reveals a single lung abscess. Culture of the sputum grows partially acid-fast branching filamentous organisms. An image of the identified organism is shown below. Which of the following is the MOST likely diagnosis? 

Question 1 of 5

2. A 33-year-old woman presents with a 6-month history of a mass on her jaw that has gradually increased in size. She reports a dull, constant pain and occasional drainage of pus through sinus tracts on her skin. Examination of the pus under the microscope shows sulfur granules. Which of the following organisms is the MOST likely cause of her symptoms? 

Question 2 of 5

3. Which of the following best describes a key laboratory difference between Nocardia and Actinomyces? 

Question 3 of 5

4. Which of the following is the treatment of choice for nocardiosis? 

Question 4 of 5

5.   A 45-year-old male presents to the clinic with complaints of painful swelling on his jaw. He has a history of poor dental hygiene and recently underwent a dental extraction. Physical examination reveals a hard, erythematous mass on his mandible with draining sinuses that exude sulfur granules. A biopsy of the lesion confirms the presence of filamentous, branching bacteria. Which of the following is the most appropriate treatment for this patient's condition? 

Question 5 of 5


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