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Preliminary experiments on the effect of freezing on IPOL D-antigen content.
| Treatment | Average D-antigen content Percentage of untreated (95% confidence interval) |
||
|---|---|---|---|
| IPV 1 | IPV 2 | IPV 3 | |
| Untreated (2–8 °C) | 100% | 100% | 100% |
| 1 freeze-thaw cycle (−20 °C) | 86% (82–90%) | 94% (90–98%) | 97% (95–99%) |
| 3 freeze-thaw cycles (−20 °C) | 70% (56–84%) | 89% (85–93%) | 89% (81–97%) |
| 5 freeze-thaw cycles (−20 °C) | 72% (58–86%) | 89% (85–93%) | 93% (81–105%) |
| 2 weeks storage (−20 °C) | 71% (61–81%) | 87% (73–101%) | 91% (83–99%) |
