Antimicrobial Effect of Cryopreservation on Donor Ocular Tissue
Bibliographic record
Abstract
PURPOSE: The aim of this study was to assess the antimicrobial effect of cryopreservation on donor globes with a previously positive culture. More specifically, our study aims at determining whether microbial organisms can still be cultured after cryopreservation in previously culture positive donor whole globes. METHODS: This is a prospective quality assurance study of microbiological cultures using donor ocular tissues obtained by the Lions Eye Bank of Manitoba and Northwestern Ontario from January 2009 to January 2010. Enucleated globes were soaked in 2.5% povidone iodide for 5 minutes, rinsed with sterile normal saline, and cultured in chocolate and Sabouraud agar and thioglycolate broth. The whole globes were then preserved in Optimyxin Plus and an antibiotic solution before being cryopreserved for 1 month. Culture-positive whole globes were thawed to room temperature and recultured on the same media to determine the effect of the cryopreservation protocol of our eye bank on bacterial counts. RESULTS: Twenty-seven donor whole globes were included in our study. Upon primary culture, all specimens had positive bacterial growth. The most common isolate on primary culture was coagulase-negative Staphylococcus (62.8%). Upon secondary culture of the thawed cryopreserved whole globes, no bacterial growth was detected on any of the culture media. CONCLUSIONS: Our study demonstrates that harvested donor whole globes with positive microbial cultures became culture negative after secondary culture by the Lions Eye Bank of Manitoba and Northwestern Ontario's cryopreservation protocol. This suggests that ocular tissues treated in this manner may be microbiologically safe and therefore able to be used for transplantation in patients.
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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 | 0.001 | 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 | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".