Epidemiologic versus Genetic Relatedness to Define an Outbreak-Associated Uropathogenic Escherichia coli Group
Bibliographic record
Abstract
SIR—France et al. [1] reported that a recently described clonal group of uropathogenic Escherichia coli appears to be distantly clonal and is not an outbreak-related group. They used a variety of strain-typing methods (enterobacterial repetitive intergenic consensus sequence 2 [ERIC 2] PCR, fumC C288T single-nucleotide polymorphism [SNP] analysis, PFGE, virulence profile, and mechanism of resistance) to show that a group of E. coli strains defined as clonal group A (CGA) by ERIC 2 PCR analysis was considerably more diverse than would be expected for an outbreak-related clone. Their conclusion, based on the analysis of their collection of 45 trimethoprim-sulfamethoxazole–resistant CGA isolates obtained from patients with cases of urinary tract infection (UTI) from 1996–1999, is valid and not surprising. However, their conclusion may lack external validity. We feel that a collection of only 45 isolates spread over 3 years, by definition, is not likely to reveal any UTI outbreak. E. coli O157:H7 that causes outbreaks of hemorrhagic colitis is also distantly clonal [2, 3]. If PFGE analysis were applied to a small collection of E. coli O157:H7 strains from a single geographic site over a 3-year period, they would also be found to be diverse, even though this E. coli serotype is implicated in well-recognized outbreaks. The authors cannot generalize from a single collection of CGA that CGA does not constitute an outbreak-associated group.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.008 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.006 | 0.005 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".