Gram-positive rods were recovered from the chest fluid of a teenager with pneumonia; CAMP test positive and catalase negative. The most likely etiologic agent is?

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Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

Multiple Choice

Gram-positive rods were recovered from the chest fluid of a teenager with pneumonia; CAMP test positive and catalase negative. The most likely etiologic agent is?

CAMP test positivity with a gram-positive rod that is catalase negative points to Arcanobacterium species. The CAMP factor produced by these organisms enhances the hemolysis of Staphylococcus aureus on blood agar, giving a positive CAMP reaction. In this scenario, the isolate is a gram-positive rod and catalase negative, which fits Arcanobacterium pyogenes (Arcanobacterium haemolyticum) best. Other options either are not rods (Streptococcus agalactiae is a cocci), or are catalase-positive (Listeria monocytogenes), or are gram-negative (Streptobacillus moniliformis), so they don’t match the findings.

Gram-positive rods were recovered from the chest fluid of a teenager with pneumonia; CAMP test positive and catalase negative. The most likely etiologic agent is?

Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

Gram-positive rods were recovered from the chest fluid of a teenager with pneumonia; CAMP test positive and catalase negative. The most likely etiologic agent is?

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