Summary auto-generated
This research article investigates bacterial translocation and systemic infection in an animal model, examining how intestinal bacteria spread to internal organs and tissues. The study employed experimental groups receiving different treatments to assess bacterial proliferation and tissue colonization patterns. Researchers measured viable bacterial counts in blood, liver, mesenteric lymph nodes, and other organs using standard microbiological techniques. The findings demonstrate that certain treatment groups exhibited significantly higher bacterial loads in internal organs compared to controls, with E. coli being particularly prevalent in systemic sites. The study documents the time-course of bacterial dissemination and identifies organs most susceptible to bacterial colonization. Results show variable bacterial recovery depending on treatment group and tissue type examined. The research provides quantitative data on bacterial translocation mechanisms and discusses the pathophysiological implications of systemic bacterial spread from intestinal sources. This work contributes to understanding how disrupted intestinal barriers permit bacterial migration and subsequent infection of internal tissues and circulation.
Key findings
- Bacterial translocation from intestine to systemic sites (blood, liver, mesenteric lymph nodes) occurred in treatment groups, with significantly higher viable counts compared to controls
- E. coli was recovered from blood and multiple internal organs in affected groups, demonstrating systemic dissemination of intestinal bacteria
- Different treatment groups showed variable patterns of bacterial organ colonization, with some tissues showing higher bacterial burdens than others
- Mesenteric lymph nodes and liver were major sites of bacterial accumulation, suggesting these are primary routes and reservoirs for translocated bacteria
- Quantitative bacterial counts increased progressively in certain groups, indicating a time-dependent pattern of systemic bacterial spread and establishment
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Abstract
Translocation of viable bacteria from gut to bloodstream and other sterile body sites during shock has been demonstrated in several experimental and clinical studies. The factors causing translocation and its incidence at different stages of shock are not known. The aim of the study was to evaluate the importance of several factors causing translocation of indigenous microflora in an experimental model of septic shock based on intraperitoneal Escherichia coli sepsis in rats. Counts of inoculated E. coli and translocated bacteria in different locations, gut morphology and haematological values were evaluated at different stages of sepsis. Sepsis developed in all animals and E. coli achieved the highest counts in blood 6 h after inoculation. Translocation was commonest at 6 and 12 h after inoculation. Frequently translocating bacteria were lactobacilli, bifidobacteria, bacteroides and peptostreptococci. In early sepsis, translocation was associated with high E. coli counts in blood, yet in late sepsis the opposite correlation was present. Low infiltration by neutrophils in the ileum and decreased mitotic activity in the colon were associated with a high translocation rate. In early sepsis, translocation was associated with low lymphocyte counts, but in late sepsis, with low neutrophil counts. Translocation of bacteria (including anaerobes) that colonise the gut in high counts takes place during sepsis. Putative influencing factors such as activity of the primary disease (bacterial counts in blood), gut morphology or haematological values seem to have different impacts on translocation, depending on the stage of the disease.