Structure of the antigenic repeating pentasaccharide unit of the LPS O-polysaccharide of <i>Cronobacter sakazakii</i> implicated in the Tennessee outbreak
Bibliographic record
Abstract
Strains of the Gram-negative bacterium Cronobacter (Enterobacter) sakazakii have been identified as emerging opportunistic pathogens that can cause enterocolitis, bacteraemia, meningitis, and brain abscess, and have been particularly associated with meningitis in neonates where infant-milk formulae has been epidemiologically linked to the disease. A study of the lipopolysaccharides produced by clinical isolates using chemical, 2D 1H and 13C NMR, and MS methods revealed that the O-polysaccharide produced by C. sakazakii (3290), a clinical strain from the Tennessee outbreak, was a branched polymer of repeating pentasaccharide units composed of 2-acetamido-2-deoxy-D-galactose, 3-(N-acetyl-L-alanylamido)-3-deoxy-D-quinovose, D-glucuronic acid, and D-glucose present in the molar ratio 1:1:1:2 and had the structure:<div class="absequation"><img src="/cisti/journals/rp/gifs/o09-004s1h.gif" /></div>The O-PS structure provides a unique specific structurally defined marker for the clinical tracking of this pathogen.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".