Colonies of Listeria monocytogenes on a sheep blood agar plate most closely resemble colonies of which organism?

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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

Colonies of Listeria monocytogenes on a sheep blood agar plate most closely resemble colonies of which organism?

Explanation:
Colonies of Listeria monocytogenes on sheep blood agar are small, gray-to-white and exhibit beta-hemolysis, patterns that closely resemble those seen with beta-hemolytic Streptococcus agalactiae. The overlap in hemolysis and colony size makes their appearance similar on routine media. Distinguishing features in practice come from other tests: Listeria is a motile Gram-positive rod that is catalase-positive and shows tumbling motility at room temperature, while Streptococcus agalactiae is a catalase-negative Gram-positive cocci in chains that is CAMP-positive.

Colonies of Listeria monocytogenes on sheep blood agar are small, gray-to-white and exhibit beta-hemolysis, patterns that closely resemble those seen with beta-hemolytic Streptococcus agalactiae. The overlap in hemolysis and colony size makes their appearance similar on routine media. Distinguishing features in practice come from other tests: Listeria is a motile Gram-positive rod that is catalase-positive and shows tumbling motility at room temperature, while Streptococcus agalactiae is a catalase-negative Gram-positive cocci in chains that is CAMP-positive.

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