Genetic analysis of Canadian isolates of C:2a:P1.2,5 and B:2a:P1.2,5<i>Neisseria meningitidis</i>strains belonging to the hypervirulent clone of ET-15
Bibliographic record
Abstract
Isolates of the hypervirulent Neisseria meningitidis clone ET-15 found to express the serogroup B antigen were investigated and compared with representative members of serogroup B and C isolates. Clonal-clustering methods clearly grouped the B:ET15 isolates with C:ET15 isolates, indicating the only major difference between the two groups was in the capsule expressed. The organization of the cps operon from the B:ET15 isolates was found to be consistent with typical serogroup B isolates and differed from serogroup C isolates only in the sialyl transferase gene present. This suggests that these strains arose via recombination of the sialyl transferase gene. Specific points of recombination could not be identified, however, the majority (64%) of the B:ET15 isolates contained a copy of pseudo-IS1106 downstream of the cps operon indicating the potential for a common ancestral origin. The combination of pulsed-field gel electrophoresis (PFGE) and sequence analysis of targeted regions of the cps operon permitted the differentiation of most B:ET15 isolates indicating that they likely arose from separate genetic events and do not represent the emergence and spread of a new clone. However, two isolates that appeared identical by all methods employed were temporally and geographically related although no epidemiological evidence is available indicating a link between these strains.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 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".