Which organism is commonly considered normal skin flora and commonly found on the surface of the skin?

Prepare for the CAMLPR Microbiology Test. Utilize flashcards and engaging multiple-choice questions, each equipped with descriptions and explanations. Ready yourself for an excellent performance!

Normal skin flora are the bacteria that live on intact skin without causing disease in healthy people. Propionibacterium acnes, now often called Cutibacterium acnes, is a classic example. It is a gram-positive anaerobic rod that thrives in oily environments like hair follicles and sebaceous glands, so it is regularly found on the skin of the face, chest, and back. Because it normally resides in these follicles and on the surface, it counts as part of the normal skin microbiota. It can contribute to acne when its activity increases or the inflammatory response is triggered, but in a healthy individual it is just a customary skin resident. Staphylococcus aureus can be carried on the skin but is more commonly associated with infection rather than being a regular, peaceful resident. Escherichia coli is a gut microbe and is not a skin inhabitant. Corynebacterium species are also present on skin, but Propionibacterium acnes is the organism most classically described as a common skin surface resident.