Organism causing IV biofilm?
**Core Concept**
The formation of biofilms on medical devices, particularly intravenous (IV) catheters, is a significant concern in clinical settings. Biofilms are complex communities of microorganisms that adhere to surfaces, leading to chronic infections and device failure. The development of IV biofilms involves the interaction between microorganisms and the host's immune response.
**Why the Correct Answer is Right**
The correct answer is **Staphylococcus epidermidis**. This organism is a common inhabitant of human skin and mucous membranes, but it can become opportunistic when it comes into contact with medical devices. S. epidermidis produces a thick layer of polysaccharide and protein matrix, which enables it to adhere to surfaces and form a biofilm. This biofilm protects the organism from antibiotics and the host's immune system, making it challenging to treat IV catheter-related bloodstream infections.
**Why Each Wrong Option is Incorrect**
* **Option A:** Escherichia coli (E. coli) is a gram-negative bacterium that can cause urinary tract infections, but it is not typically associated with IV biofilm formation.
* **Option B:** Pseudomonas aeruginosa is a gram-negative bacterium that can cause opportunistic infections in immunocompromised patients, but it is not the primary organism responsible for IV biofilm formation.
* **Option C:** Candida albicans is a fungus that can cause opportunistic infections in immunocompromised patients, but it is not typically associated with IV biofilm formation.
**Clinical Pearl / High-Yield Fact**
S. epidermidis is a common cause of IV catheter-related bloodstream infections, and its biofilm formation is often resistant to antibiotics. Therefore, it is essential to use antimicrobial-coated catheters and sterile technique when inserting IV catheters to reduce the risk of biofilm formation.
**Correct Answer:** C. Staphylococcus epidermidis