Evaluation of an IgM/IgG Sensitive Enzyme Immunoassay and the Utility of Index Values for the Screening of Syphilis Infection in a High-Risk Population
Why this work is in the frame
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Bibliographic record
Abstract
BACKGROUND: Increasing interest in the use of enzyme immunoassays (EIA) for syphilis screening has generated a considerable need for data on the performance of such tests. METHODS: We compared the performance of 1 EIA, the TREP-SURE EIA to that of the Venereal Disease Research Laboratory (VDRL) and Treponema pallidum particle agglutination assay (TPPA) in the detection of infection with Treponema pallidum. In total, 674 specimens were tested by VDRL and EIA (356 VDRL-nonreactive and 318 VDRL-reactive). All specimens that were found to be reactive by either the VDRL or EIA were subsequently analyzed by TPPA. RESULTS: We found that the TREP-SURE EIA was marginally less sensitive than the VDRL test for screening, but was significantly more specific. All EIA-TPPA discordant specimens were analyzed by multiple tests, including Immunoglobulin M- and G-specific Western blots and an IgM-specific EIA. Signal-to-cutoff ratios (index values) generated by the TREP-SURE EIA were also investigated. It was found that these values may be instructive regarding the interpretation of test results, as they were found to correlate strongly with the probability of positivity on a TPPA assay. Specimens that reacted positively on the EIA with very high index values were found overwhelmingly to be reactive by TPPA, perhaps obviating the need for the testing of most EIA positive specimens with a secondary treponemal test. CONCLUSIONS: An IgM/IgG sensitive EIA would be an effective alternative to VDRL for syphilis screening. Using the EIA index values may provide additional, helpful information to the diagnostic process.
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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 | 0.002 | 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 | 0.000 |
| 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