Seneca Valley Virus

Recently, there has been an increase in cases of Seneca Valley Virus (SVV) across the nation in grow-finish hogs, sow/boar market animals, and exhibition swine.  SVV is not new to the United States, however there has been no explanation for the increased number of cases clinically identified and diagnosed. 

We have not had any cases of SVV diagnosed within the state of Colorado.  The Colorado Department of Agriculture has investigated trace-backs from Colorado-origin animals that were diagnosed with SVV at slaughter plants in other states, but we have found no clinical evidence of SVV in the origin commercial herds during these investigations. 

We want to remain vigilant in our surveillance for this disease in both commercial swine herds and in exhibition swine.  Colorado has a large population of exhibition swine, which pose an increased risk in disease transmission due to commingling of swine in confined spaces, often followed by dispersal of swine back to their farms.  Other states have diagnosed SVV in swine at fairs, shows, and exhibitions. 

As you know, this virus is of great concern because it is clinically indistinguishable from foreign animal diseases such as Foot and Mouth Disease (FMD), Swine Vesicular Disease (SVD), Vesicular Exanthema of Swine (VES), and Vesicular Stomatitis Virus (VSV).  Gross lesions and clinical symptoms include:

  • Multifocal, round, discrete erosive and/or ulcerative lesions on the distal limbs, especially around the coronary bands. 
  • Crusting and sloughing of the hoof wall may also be observed.
  • Lameness can occur due to the sores on the hooves. 
  • Fluid filled vesicles and multifocal superficial and/or deep ulcers have been described in and around the oral mucosa, snout, and nares. 
  • Lethargy, inappetence, and fevers of up to 105¡F have also been reported. 

All vesicular diseases are reportable.  If you notice any of the clinical signs or lesions as described above in swine, contact the Colorado State Veterinarian’s Office at (303)869-9130 or the USDA–APHIS–Veterinary Services Colorado office at (303)231-5385.  State and federal animal health officials will determine if an investigation is necessary. 

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