Problems With Case Definitions and a Need for Revisions by the International Encephalitis Consortium
Bibliographic record
Abstract
10.1093/cid/civ314 To the Editor—Venkatesan et al have recently proposed case definitions for encephalitis and encephalopathy of presumed infectious or autoimmune etiology [1]. For possible encephalitis, the major criterion (presentation to medical attention with decreased or altered level of consciousness, lethargy, or personality change lasting at least 24 hours with no alternative cause identified) and 2 of 6 minor criteria are required. For probable encephalitis, the major criterion and at least 3 of the minor criteria are required. For confirmed encephalitis, the criteria for probable encephalitis must be met plus at least 1 of the following: (1) pathological confirmation of brain inflammation consistent with encephalitis; (2) defined pathologic, microbiologic, or serological evidence of acute infection with a microorganism strongly associated with encephalitis from an appropriate clinical specimen; or (3) laboratory evidence of an autoimmune condition strongly associated with encephalitis. A key problem that needs clarification is whether the confirmatory criterion should be considered irrelevant for the case definition unless the major criterion and at least 3 minor criteria are fulfilled. This appears to be a serious weakness in the case definitions. There are other potential problems. What if a plausible alternative cause is identified for decreased level of consciousness (the required major criterion)? For example, if a patient had associated hyponatremia and thereby could not meet the major criterion, but met all 6 of the minor criteria and a confirmatory criterion, this patient would not meet the case definition for possible encephalitis, even if there was confirmatory pathological evidence and a positive virological test.
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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 | 0.245 | 0.499 |
| Meta-epidemiology (narrow) | 0.001 | 0.003 |
| Meta-epidemiology (broad) | 0.003 | 0.003 |
| Bibliometrics | 0.008 | 0.006 |
| Science and technology studies | 0.014 | 0.018 |
| Scholarly communication | 0.019 | 0.023 |
| Open science | 0.017 | 0.010 |
| Research integrity | 0.046 | 0.084 |
| Insufficient payload (model declined to judge) | 0.007 | 0.004 |
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".