<i>Staphylococcus aureus menD</i>and<i>hemB</i>Mutants Are as Infective as the Parent Strains, but the Menadione Biosynthetic Mutant Persists within the Kidney
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Bibliographic record
Abstract
Small colony variants (SCVs) of Staphylococcus aureus were generated via mutations in menD or hemB, yielding menadione and hemin auxotrophs, respectively, and studied in the rabbit endocarditis model. No differences in the 95% infectious dose occurred between strains with regard to seeding heart valves ( approximately 10(6) cfu) or other target organs. No differences were observed between the response of the hemB mutant to oxacillin therapy and that of the parent strain in any target tissues, and significant reductions in bacterial densities were seen in all tissues (compared with untreated controls). In contrast, oxacillin therapy did not significantly reduce bacterial densities of the menD mutant in either kidney or spleen and significantly reduced densities within vegetations. These data show that SCVs are able to colonize multiple tissues in vivo and that the menD mutation provides the organism with a survival advantage during antimicrobial therapy, compared with its parent strain, in selected target tissues.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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