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[Analysis of aerobic and anaerobic bacterial flora colonizing drains after surgical abdominal incisions]
W Michalska1, J Chylak, R Marciniak
1Zakład Mikrobiologii Lekarskiej Instytutu Mikrobiologii i Chorób Zakaźnych AM w Poznaniu.
Abstract:
Aerobic and anaerobic bacterial flora of post-operative incisions with drainage were examined. From each of 28 patients three specimens were taken; during operation (smear from peritoneal cavity), liquid from drain (taken at 3-th day after operation) and smear from drain taken at the end of drainage. Enterococci, Enterobacteriaceae spp. and anaerobes, especially Bacteroides spp. were most often isolated from specimens taken during operation. Enterococci and coagulase negative Staphylococci-often resistant to methicillin, were most often isolated from specimens taken at the end of drainage.
Insights
Post-operative incision bacterial flora analysis revealed distinct microbial profiles during surgery versus at drain removal. Early surgical site infections show Enterobacteriaceae and anaerobes, while later infections are dominated by methicillin-resistant Staphylococci.
Area of Science:
- Microbiology
- Surgical Site Infections
- Bacterial Flora Analysis
Context:
- Investigating microbial contamination in post-operative incisions with drainage.
- Sampling occurred at three key time points: during operation, day 3 post-operation, and at drain removal.
- Study involved 28 patients undergoing surgical procedures with drainage.
Purpose:
- To characterize the aerobic and anaerobic bacterial flora of surgical incisions.
- To identify shifts in microbial composition throughout the post-operative drainage period.
- To determine common pathogens and their antibiotic resistance patterns in surgical wounds.
Summary:
- Specimens from the peritoneal cavity during operation yielded Enterococci, Enterobacteriaceae, and anaerobes (e.g., Bacteroides spp.).
- Drain fluid and swabs taken at the end of drainage predominantly showed Enterococci and coagulase-negative Staphylococci.
- A significant proportion of isolated coagulase-negative Staphylococci exhibited methicillin resistance.
Impact:
- Highlights the dynamic nature of surgical site bacterial colonization.
- Informs targeted antibiotic strategies for managing post-operative infections.
- Underscores the prevalence of antibiotic-resistant bacteria in late-stage surgical wound infections.