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Mechanisms of microbial synergy in polymicrobial surgical infections
Abstract:
Surgical infections are almost always polymicrobial, yet the critical importance of bacterial mixtures in these infections has received relatively little attention. The convincing data on the prevalence of mixed infections in surgery are reviewed. Both clinical and experimental evidence indicate that true synergy between certain aerobes and anaerobes may exist. Of the possible mechanisms of synergy, the most important seems to be the ability of anaerobes, their metabolic products, or their capsules to inhibit phagocytosis of aerobes by leukocytes. Other mechanisms of importance in special microbial combinations include provision of essential nutrients such as vitamin K, succinate, and various growth factors by one microbe to the other; alteration of local environment, including reduction of the oxygen tension and lowering of redox potential; and the provision of substances toxic to the host that permit species of bacteria to flourish concurrently. Further study of these interactions will shed light on the causes and correction of treatment failure.
Insights
Surgical infections often involve multiple bacteria, with synergistic interactions between aerobic and anaerobic microbes potentially driving treatment failures. Understanding these complex bacterial mixtures is crucial for improving patient outcomes.
Area of Science:
- Microbiology
- Infectious Diseases
- Surgical Pathology
Background:
- Surgical infections are frequently polymicrobial, involving complex bacterial communities.
- The significance of these bacterial mixtures in surgical settings is often underestimated.
- Existing research highlights the prevalence of mixed infections in surgical contexts.
Purpose of the Study:
- To review the prevalence of mixed bacterial infections in surgery.
- To explore the evidence for synergistic interactions between aerobic and anaerobic bacteria.
- To elucidate the mechanisms underlying microbial synergy in surgical infections.
Main Methods:
- Review of clinical data on surgical infections.
- Analysis of experimental evidence for bacterial synergy.
- Identification and categorization of potential mechanisms of microbial interaction.
Main Results:
- Evidence supports the existence of true synergy between certain aerobic and anaerobic bacteria.
- Key mechanisms include inhibition of phagocytosis by anaerobes, nutrient provision, environmental alteration (e.g., reduced oxygen tension), and production of host-toxic substances.
- Anaerobic bacteria can inhibit the phagocytosis of aerobic bacteria by leukocytes.
Conclusions:
- Bacterial synergy plays a critical role in the pathogenesis of surgical infections.
- Understanding these interactions is essential for addressing treatment failures.
- Further research into microbial interactions can guide improved therapeutic strategies.