Evaluation of a New Chromogenic Medium (StrepB Select) for Detection of Group B Streptococcus from Vaginal-Rectal Specimens
Why this work is in the frame
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Bibliographic record
Abstract
We compared StrepB Select medium (Select) after enrichment with conventional culture for the detection of Group B Streptococcus (GBS). Postenrichment sensitivities of Select and conventional culture were 98.8 % and 92.2%, respectively (P < 0.05). Select was superior for detection of GBS from vaginal-rectal specimens. Growth of non-GBS colonies required additional work to exclude the presence of GBS, especially after 48 h of incubation. Incubation of Select beyond 24 h did not significantly increase the yield of GBS. As group B Streptococcus (GBS) remains a significant cause of neonatal morbidity and mortality, antenatal screening for GBS at 35 to 37 weeks of gestation is recommended to deter-mine whether antimicrobial prophylaxis is warranted (4, 7). The use of newer, chromogenic media may improve the yield of GBS, while reducing labor and turnaround time (5). We evaluated a new chromogenic medium, StrepB Select (Select; Bio-Rad Laboratories, Marnes-la-Coquette, France), a selec-tive medium for the detection and presumptive identification of GBS in vaginal and vaginal-rectal specimens (9). We com-pared the recovery of GBS from StrepB Select with that from conventional culture on colistin-nalidixic acid agar with 5% sheep blood (CNA; Oxoid, Nepean, Ontario, Canada) with and without broth enrichment using Streptococcus selective
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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 | 0.001 | 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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 it