Editor’s note: Click here to review USDA’s Recommendations for Handling Herds Suspected of having SVA to ensure that foreign animal disease investigations occur per agency guidelines.

Over the past 10 days (July 8-17, 2016), there have been 12 cases of vesicular disease that have been discovered at two slaughter plants in the state of Iowa.

All cases have tested negative for Foot and Mouth Disease (FMD), but 75% of them have tested positive for Senecavirus A (Seneca Valley Virus). In all cases, there was NO report of seeing clinical lesions at the site at the time of loading the market pigs, but the lesions and/or lameness were discovered during ante-mortem inspection by the USDA FSIS veterinarian. 

This release is an awareness piece to be shared with veterinarians, pork producers, contract growers and employees that during the load out process to be looking for any combination of the following clinical signs:

  • Vesicles (intact or ruptured) on the snout or in the oral mucosa (any muco-cutaneous junction)
  • Acute lameness in a group of pigs.
  • May see ulcerative lesions on or around the hoof wall. (Figure 2. Ulcerative lesion on coronary band)
  • May see redness or blanching around the coronary bands.
  • May see eventual sloughing of the hoof wall.
  • In the early course of the disease, fevers up to 105 degrees F have been reported.
  • Anorexia, lethargy and/or febrile

What to do if you see or are made aware of clinical signs consistent with vesicular disease?

Authors contributing: Chris Rademacher, Rodger Main, Phil Gauger, Dave Schmitt, Jordan Kraft