The Effect of Co-Culturing Lactobacillusn salivarius with Clostridium difficile on the Production of Clostridium difficile Toxi A and Toxin B
Bibliographic record
Abstract
Antibiotics alter the composition, and numbers of the normal gastrointestinal (GI) microflora, providing Clostridium difficile , a spore forming, Gram-positive bacillus, the opportunity to colonize the GI tract. 1,2,3 C. difficile is the leading cause of hospital-acquired diarrhea, resulting in death of 1% to 2% of infected patients. 2,3 It is responsible for GI diseases ranging from antibiotic-associated diarrhea to the more severe pseudomembranous colitis. 4 In addition to having resistance to various antimicrobial drugs, the treatment of C. difficile infections with specific antibiotics such as metronidazole often results in relapse, resistance development, and further disruption of the GI microflora. 4 Thus, the establishment of an alternative method to combat C. difficile is crucial. Previous studies show that Lactobacillus salivarius , a promising probiotic organism, produces a potent two-peptide bacteriocin that hinders C. difficile growth. 5 Previous research indicates that L. salivarius is effective in reducing C. difficile cell count, although none investigated the effect of L. salivarius on the two major virulence factors – toxin A (TcdA) and toxin B (TcdB). 6 To this end, this investigation aimed to investigate the influence of L. salivarius on TcdA and Tcd B production. L. salivarius and C. difficile were co-cultured, growth curves of C. difficile , L. salivarius , and the co-culture were generated, and cell-free supernatants at various stages were examined to quantify TcdA and TcdB concentrations. Although there was no noticeable decrease in TcdA and TcdB concentration in the co-culture, C. difficile toxin production was observed to be more multi-phasic in co-culture. Moreover, co-culturing L. salivarius with C. difficile significantly hindered C. difficile growth, confirming previous results. Taken together, the data suggests that the presence of L. salivarius enhances C. difficile toxin production per cell, implying the potential dangers of initiating clinical trials without a comprehensive investigation of the effects of probiotics and the production of C. difficile virulence factors.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.005 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".