Which organism is a member of the HACEK group and is commonly implicated in endocarditis, often listed alongside Eikenella corrodens and Capnocytophaga species?

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!

HACEK organisms are a small group of fastidious Gram-negative bacteria classically linked to native valve endocarditis, often causing culture-negative cases because they grow slowly and require special media or extended incubation.

Cardiobacterium hominis is a classic member of this group. It’s a slow-growing Gram-negative rod that has a well-established association with endocarditis, frequently taught alongside other HACEK members such as Eikenella corrodens and Capnocytophaga species. Recognizing Cardiobacterium hominis as part of this group helps explain why endocarditis can present with subtle initial culture results and why clinicians consider extended culture times or specialized media.

So, the organism that fits the described role is Cardiobacterium hominis, a staple example of the HACEK group involved in endocarditis.