The description of "Medusa head" colonies on solid agar is most characteristic 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

The description of "Medusa head" colonies on solid agar is most characteristic of which organism?

Explanation:
Medusa head colonies describe a starburst, radiating edge from the colony, with hair-like extensions spreading out on solid media. This distinctive morphology is classically linked to Bacillus anthracis when grown on blood agar, where the colonies become large, flat, and show those filamentous, Medusa-like projections at the edges. The other organisms listed tend to form more typical, smooth, small to medium colonies without that radiating, filamentous margin. Thus the Medusa head pattern is a classic clue pointing toward Bacillus anthracis in this context.

Medusa head colonies describe a starburst, radiating edge from the colony, with hair-like extensions spreading out on solid media. This distinctive morphology is classically linked to Bacillus anthracis when grown on blood agar, where the colonies become large, flat, and show those filamentous, Medusa-like projections at the edges. The other organisms listed tend to form more typical, smooth, small to medium colonies without that radiating, filamentous margin. Thus the Medusa head pattern is a classic clue pointing toward Bacillus anthracis in this context.

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