The primary source of organisms causing surgical site infections (SSIs) is the patient's own endogenous flora. Bacteria from the skin, mucous membranes, or gastrointestinal tract contaminate the surgical site, leading to infection. Common pathogens include Staphylococcus aureus, coagulase-negative staphylococci, and Enterobacteriaceae.
Why the Other Options Are Incorrect?
* A. Operating room environment - While environmental contamination can contribute, it is not the primary source.
* B. Operating room personnel - Infection control measures (hand hygiene, gloves, masks) reduce transmission from personnel.
* D. Healthcare personnel's hands - Although hand contamination is a risk, it is secondary to the patient's endogenous flora.
CBIC Infection Control Reference
According to APIC guidelines, the patient's own flora is the primary source of SSIs.