According to a report released by the North American Spray Dried Blood and Plasma Products association, NASDBPP and FDA conducted controlled experiments to test the hypothesis that spray-dried porcine plasma may contain infective PEDv. NASDBPP concludes “the results of these experiments support the conclusion that spray-dried porcine plasma is a safe feed ingredient. The manufacturing process under industry standards inactivates PEDv. However, like any feed ingredient, post-processing contamination is a constant risk and may be the cause of the infective PEDv found on porcine plasma as reported by the CFIA.”
| Hypothesis: If PCR+ spray-dried porcine plasma contains infective PEDv and is a vector spreading PED: | |
|---|---|
| Then: | Results of controlled experiments: |
| 1: PEDv will survive spray drying. | 1: Spray drying inactivated PEDv. |
| 2: Retained samples of plasma investigated by CFIA in bioassay will contain infective PEDv. | 2: Retained plasma samples subjected to bioassay studies by FDA and NASDBPP were not infective for PEDv. |
| 3: Nursery feed containing PEDv PCR+ plasma should infect pigs. | 3: Two independent studies using 21-day-old weaned pigs fed 5% PEDv PCR+ plasma in a meal diet for 21 or 28 days post-weaning did not infect pigs with PEDv. |
| 4: Spray-dried plasma contaminated post-processing with PEDv should survive through distribution until consumed by pigs. | 4: PEDv inoculated on spray-dried plasma did not survive by: 7 days stored at 71°F (22°C) 14 days stored at 54°F (12°C) 21 days stored at 39°F (4°C) |
| 5: Pigs in a PEDv-free region fed PEDv PCR+ plasma from the US should become infected with PEDv. | 5: Millions of pigs in Brazil and Western Canada fed PEDv PCR+ porcine plasma imported from the US since last summer have not developed PEDv. |
| Conclusion: • Experimental results show that PCR+ spray-dried porcine plasma does not contain infective PEDv. • Infective PEDv reported by CFIA on samples of spray-dried porcine plasma collected from the field is likely the result of post-processing contamination. |
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The complete report can be viewed at https://www.aasv.org/pedv/research/NASDBPP_research.pdf