In carriers, staphylococci are found in the following sites except –
**Core Concept**
Staphylococci are a type of Gram-positive bacteria commonly found on human skin and mucous membranes. Carriers are individuals who harbor these bacteria without showing any symptoms. Staphylococci can colonize various body sites, including the nostrils, skin, and mucous membranes.
**Why the Correct Answer is Right**
Carriers can harbor staphylococci in their nostrils (nasal carriage), skin, and mucous membranes. However, the gut is not a common site for staphylococcal carriage. The gut is primarily colonized by a different type of bacteria, including Gram-negative rods and anaerobes. Staphylococci are not typically found in the gut due to the presence of acidic stomach pH and the competitive exclusion by other gut flora.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as staphylococci can indeed colonize the skin.
* Staphylococci are commonly found on the skin, particularly in the nostrils and on the hands.
**Option B:** This option is incorrect as staphylococci can indeed colonize mucous membranes.
* Staphylococci can colonize mucous membranes, including the eyes, nose, and throat.
**Option C:** This option is incorrect as staphylococci can indeed colonize the nostrils.
* Nasal carriage of staphylococci is a common phenomenon, particularly in healthcare workers.
**Clinical Pearl / High-Yield Fact**
Staphylococci are a common cause of skin and soft tissue infections, including impetigo and folliculitis. They can also cause more severe infections, such as bacteremia and endocarditis, particularly in individuals with compromised immune systems.
**Correct Answer: D**