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Feed batch sequencing to decrease the risk of porcine epidemic diarrhea virus (PEDV) cross-contamination during feed

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Feed batch sequencing can reduce, but not eliminate, porcine epidemic diarrhea virus (PEDV) contamination. While PEDV RNA levels decreased in sequenced batches, some feed remained infectious, highlighting ongoing risks in feed production.

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Area of Science:

  • Animal Science
  • Veterinary Virology
  • Food Safety Engineering

Background:

  • Porcine epidemic diarrhea virus (PEDV) is transmitted via contaminated feed.
  • Effective strategies are needed to prevent PEDV cross-contamination in feed manufacturing.

Purpose of the Study:

  • To evaluate the efficacy of feed batch sequencing in minimizing PEDV cross-contamination.
  • To assess PEDV RNA levels and infectivity in sequentially produced feed batches.

Main Methods:

  • Manufactured PEDV-free feed as negative control and inoculated feed as positive control.
  • Mixed and conveyed feed batches sequentially in a pilot-scale mill without intermediate cleaning.
  • Analyzed feed for PEDV RNA using RT-PCR and assessed infectivity via pig bioassays.

Main Results:

  • Sequenced batches showed reduced PEDV RNA levels compared to the positive control.
  • PEDV RNA was undetectable in mixer samples from sequences 2-4 and bucket elevator samples from sequences 3-4.
  • Despite undetectable RNA, some sequenced feed (sequence 1 mixer, sequence 2 mixer) transmitted infectious PEDV to pigs.

Conclusions:

  • Feed batch sequencing reduces PEDV RNA contamination but does not eliminate infectious virus.
  • A sequencing protocol can mitigate, but not completely remove, the risk of PEDV carryover in feed production.