What type of bacteria is Cutibacterium acnes?

Prepare for the COMAT Foundational Biomedical Science Exam with comprehensive questions. Study with flashcards and detailed explanations to boost your exam readiness and understanding.

Cutibacterium acnes is classified as a Gram-positive anaerobic rod. This bacterium is commonly found on human skin and is known for its role in the development of acne. As a Gram-positive organism, it has a thick peptidoglycan layer in its cell wall, which retains the crystal violet stain used in the Gram stain procedure, giving it a purple appearance under the microscope. The anaerobic nature indicates that it thrives in environments lacking oxygen, which is typical of sebaceous glands where it commonly resides. Understanding these characteristics is important when studying skin microbiota and their relationship to skin conditions, particularly acne vulgaris.

In the context of the other options, they do not accurately describe Cutibacterium acnes. It is neither an aerobic bacillus, which would require oxygen for growth, nor a Gram-negative coccus, as those characteristics do not match its morphology or Gram staining properties. Additionally, it is not classified as a mycobacterial species, which have distinct cell wall components and are associated with diseases like tuberculosis. Hence, identifying Cutibacterium acnes correctly as a Gram-positive anaerobic rod helps in appreciating its role in dermatological contexts.

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