Polyarthritis, Fever and a Rash in a Young Girl
Bibliographic record
Abstract
A previously healthy six-year-old girl had developed a fever five days before presentation. Two days later, she had an onset of diffuse abdominal pain, intermittent vomiting and loose, nonbloody stools. On the fourth day of fever, she described pain on moving her arms and legs, and the following day, she was brought to the IWK Health Centre in Halifax, Nova Scotia. Her history showed up-to-date immunizations, and the absence of medications or known allergies. There was no history of trauma, infectious contacts, travel outside the Maritime provinces, or consumption of unpasteurized dairy products or undercooked meats. She had no history of animal exposure, except for a white rat kept in a cage in the family basement. On examination, she was febrile (38.8°C), unwell looking and tachycardic, but was oriented, normotensive and in no respiratory distress. Her head and neck examinations revealed periorbital edema, marked erythema of the buccal mucosa, and a ‘strawberry tongue’ with no oral ulcers, tonsillar exudate, cervical adenopathy or conjunctival injection. A blanching erythematous maculopapular rash was visible on the face, trunk, arms and legs, being most prominent on the hands and feet. A palpable, nonblanching petechial exanthem was also present on the palms of the hands and soles of the feet, with marked periungual erythema and capillary vessel dilation at the nail beds. No puncture marks or scratches were visible. The wrists, elbows, knees and small joints of the hands were swollen and warm to palpation, but without erythema. Any motion of these joints was limited and painful. There was periarticular swelling of the ankles and feet. The precordium was hyperdynamic, with a 2/6 vibratory systolic ejection murmur at the upper left sternal border. There were no bruits. There was no hepatosplenomegaly or generalized adenopathy. The white blood cell count was 6.0×109/L (56% neutrophils, 12% bands and 13% lymphocytes), the hemoglobin level was normal and the platelet count was 31×109/L. The C-reactive protein level and erythrocyte sedimentation rate were elevated at 219 mg/L (reference less than 5.3 mg/L) and 65 mm/h (reference 0 mm/h to 9 mm/h), respectively. Renal function and liver enzymes tests were normal. Urinalysis revealed trace blood, and hyaline and granular casts. Her chest radiograph and echocardiogram were normal. Empirical antibiotic therapy was started. A blood culture taken on the day of presentation was positive at 15 h. What is the diagnosis?
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 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".