Common source of staphylococcus in hospital is
**Core Concept**
The question is testing the knowledge of hospital-acquired infections, specifically the common sources of Staphylococcus species in a healthcare setting. Staphylococci are gram-positive bacteria that can colonize human skin and mucous membranes, and can cause a range of infections from mild to severe.
**Why the Correct Answer is Right**
The correct answer is a patient's own skin or nasal mucosa. Staphylococci are normal inhabitants of human skin and mucous membranes, and can be transferred to hospital equipment, surfaces, or other patients through contact. This process is known as horizontal transmission. The bacteria can also be spread through healthcare workers' hands, who may not always follow proper hand hygiene protocols. The most common Staphylococcus species found in hospitals is Staphylococcus aureus, which can cause a range of infections, including skin and soft tissue infections, pneumonia, and bloodstream infections.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while healthcare workers can be a source of Staphylococcus, they are not the primary source in a hospital setting. Healthcare workers can spread the bacteria through contact with infected patients or contaminated equipment, but they do not typically harbor the bacteria themselves.
**Option B:** This option is incorrect because hospital equipment is not a primary source of Staphylococcus. While equipment can become contaminated with the bacteria, it is not a common source of infection in hospitals.
**Option C:** This option is incorrect because contaminated food or water is not a common source of Staphylococcus in hospitals. While foodborne illness can occur in hospitals, it is not typically caused by Staphylococcus.
**Clinical Pearl / High-Yield Fact**
To prevent the spread of Staphylococcus in hospitals, healthcare workers should always follow proper hand hygiene protocols, including washing their hands with soap and water or using hand sanitizer before and after interacting with patients. This can help reduce the risk of horizontal transmission and prevent the spread of the bacteria.
**Correct Answer: D. Patient's own skin or nasal mucosa**