Microbiology Quiz #2: Gram Stain and other stains

1. A microbiology laboratory receives a sputum sample from a patient with a suspected pulmonary infection. After performing a Gram stain, the laboratory technician observes purple, spherical bacteria in clusters. Which of the following organisms is most likely present in the sample? 

Question 1 of 5

2. A patient presents with a chronic cough, night sweats, and weight loss. A sputum sample is sent for acid-fast bacilli (AFB) staining using the Ziehl-Neelsen technique. Which of the following organisms is this stain most useful for identifying? 

Question 2 of 5

3. A patient with a history of HIV/AIDS presents with signs of meningitis. A cerebrospinal fluid (CSF) sample is stained with India ink. This staining technique is particularly useful for the visualization of which of the following pathogens? 

Question 3 of 5

4. A biopsy from a patient with suspected fungal pneumonia is performed, and the sample is stained with a silver stain. This staining technique is particularly useful for identifying which of the following pathogens? 

Question 4 of 5

5. A blood smear from a patient returning from a trip to sub-Saharan Africa is stained with Giemsa. This stain is particularly useful for identifying which of the following pathogens? 

Question 5 of 5


 

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