For the first time since being eradicated in the U.S. commercial swine herd in 2004, pseudorabies (PRV) has been confirmed in herds in Iowa and Texas.
The USDA’s Animal and Plant Health Inspection Service (APHIS) National Veterinary Services Laboratories (NVSL) confirmed the detection of PRV antibodies in a small commercial swine facility in Iowa. The discovery was made through routine testing rather than pre-movement surveillance.
Traceback Confirms Texas Connection
Initial traceback efforts reveal that five affected boars in the Iowa facility originated from an outdoor production site in Texas. Subsequent testing of the Texas herd also returned positive results for the virus.
APHIS is currently collaborating with the Iowa Department of Agriculture and Land Stewardship (IDALS) and the Texas Animal Health Commission (TAHC) to expand traceback efforts and identify any further exposures.
The Feral Swine Risk
Although the commercial industry has been free of the disease for more than 20 years, PRV remains prevalent in feral swine populations across the U.S. Officials believe this detection is a result of “spillover” from wild populations.
“Pseudorabies is still found in wild or feral swine populations, which remain a potential threat of exposure for domestic pigs,” an APHIS release stated. The Texas herd involved was housed outdoors, where contact with feral swine is possible.
Impact and Symptoms
PRV is a contagious viral disease that serves as a significant threat to herd productivity:
- Adult Pigs: Causes abortions, stillbirths, and respiratory issues.
- Newborn Pigs: Attacks the respiratory and central nervous systems, leading to sneezing, incoordination, and high mortality rates.
While pigs are the only natural hosts, PRV can infect most other mammals—though humans, horses, and birds are considered resistant.
Official Response and Market Safety
Iowa Secretary of Agriculture Mike Naig emphasized that the state is moving decisively to eliminate the disease.
“The Iowa Department of Agriculture and Land Stewardship has spent years preparing for these types of animal health events,” Naig said. “It’s important for people to know that pseudorabies is not a food safety concern, and this virus does not pose a risk to consumers. The United States’ pork supply remains safe and secure.”
Export Implications
Despite the lack of risk to food safety, the detection could have economic repercussions. APHIS warns there may be limited, short-term impacts on the exports of U.S. swine and swine genetics as trading partners evaluate the new health status.
“Established protocols were implemented immediately in response to the incident and remain in place to safeguard the commercial swine industry,” the National Pork Producers Council said in a statement. “These steps were successfully deployed through swift action and close coordination with USDA and the IDALS. The National Pork Producers Council and Iowa Pork Producers Association support these efforts and remain committed to a coordinated response to prioritize biosecurity and prevent further occurrences.”
