If microorganisms originating from an endogenous source contaminate a surgical wound, what would be the most likely cause?
  1. Surgical instruments not properly sterilized
  2. Bacteria that are already present inside the patient's body
  3. Improper surgical gloving techniques
  4. Bacteria embedded in gauze sponges
Explanation
Answer: B - Bacteria that are already present inside the patient's body represent contamination by microorganisms originating from an endogenous source. The other choices would represent contamination by microorganisms originating from anexogenous source.
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