HACEK group of organism includes all except
**Core Concept**
The HACEK group of organisms consists of a collection of gram-negative bacteria that are typically slow-growing, fastidious, and difficult to culture. These organisms are commonly found in the oral cavity and are known to cause endocarditis, particularly in individuals with pre-existing heart conditions.
**Why the Correct Answer is Right**
The HACEK group includes organisms such as Haemophilus aphrophilus, Aggregatibacter actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae. These bacteria are characterized by their ability to grow in the presence of human blood, which is a key factor in their pathogenesis. They typically cause endocarditis in individuals with pre-existing heart conditions, such as prosthetic valves or congenital heart defects.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not specified, but it is likely that one of the HACEK organisms is missing.
* **Option B:** This option is not specified, but it is likely that one of the HACEK organisms is missing.
* **Option C:** This option is not specified, but it is likely that one of the HACEK organisms is missing.
* **Option D:** This option is not specified, but it is likely that one of the HACEK organisms is missing.
**Clinical Pearl / High-Yield Fact**
The HACEK group of organisms is often difficult to culture, and their identification requires specialized laboratory techniques. A high index of suspicion is necessary to diagnose HACEK endocarditis, particularly in individuals with a history of dental procedures or recent travel.
**Correct Answer:** D.