Senecavirus A (Seneca Valley Virus) in Swine – Cases at Slaughter Plants

Over the past 10 days (July 8-17, 2016), there have been 12 cases of vesicular disease that have been discovered at 2 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)
    • Figure 1
    • May or may not be seen in association with lame pigs
  • Acute lameness in a group of pigs.
    • May see ulcerative lesions on or around the hoof wall. (Figure 2)
    • May see redness or blanching around the coronary bands.
    • May see eventual sloughing of the hoof wall.
  • Anorexia, lethargy and/or febrile
    • In the early course of the disease, fevers up to 105 degrees F have been reported.
SVA - Ruptured Nasal Vesicle
Figure 1. Ruptured Nasal Vesicle
SVA - Ulcerative lesion on coronary band
Figure 2. Ulcerative lesion on coronary band

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

  • Immediately contact the State Veterinarian and/or APHIS Assistant Director (AD)
    • IA – Dave Schmitt (515-281-8601) or Kevin Petersburg (515-284-4140)
    • They will decide if a Foreign Animal Disease (FAD) investigation is warranted and how to proceed.
    • Quarantine the farm (and yourself if on farm) until directed by State and Federal Authorities.


Date: 07/19/2016
Authors contributing: Chris Rademacher, Rodger Main, Phil Gauger, Dave Schmitt, Jordan Kraft