Foot-and-Mouth Disease in Pigs: Vesicles, Lameness, and Emergency Response
- See your vet immediately if your pig has sudden blisters on the snout, mouth, or feet, especially with fever, drooling, or reluctance to stand.
- Foot-and-mouth disease (FMD) is a highly contagious viral disease of cloven-hoofed animals and is a reportable foreign animal disease in the United States.
- In pigs, lesions on the feet can be especially severe and may cause marked lameness, lying down more than usual, or even hoof damage in serious cases.
- FMD cannot be confirmed by appearance alone. Other vesicular diseases in pigs can look similar, so laboratory testing directed by animal health authorities is essential.
- Do not move affected pigs, equipment, feed, or manure until your vet and animal health officials advise you on next steps.
What Is Foot-and-Mouth Disease in Pigs?
Foot-and-mouth disease (FMD) is a severe, fast-spreading viral disease that affects pigs and other cloven-hoofed animals. In pigs, it commonly causes fever and fluid-filled blisters, called vesicles, on the feet, snout, and in the mouth. Those lesions can rupture quickly, leaving painful raw areas that make eating and walking difficult.
This disease is a veterinary emergency because it spreads very efficiently between susceptible animals and can have major animal health and agricultural consequences. In the United States, FMD is considered a foreign animal disease and suspected cases must be reported right away. It is also important to know that FMD is not the same as human hand, foot, and mouth disease.
Pigs can develop especially severe foot lesions with FMD. Some may be reluctant to rise, shift weight, or spend much more time lying down. In young pigs, the disease can be more serious, including sudden death related to heart damage in some outbreaks.
Because several other swine diseases can look nearly identical at first, no pet parent or farm caretaker should try to sort this out alone. Your vet and animal health officials are the right team to guide testing, movement restrictions, and herd-level response.
Symptoms of Foot-and-Mouth Disease in Pigs
- Fever
- Vesicles or ruptured blisters on the feet, especially around the coronary band and between the toes
- Lameness or reluctance to stand and walk
- Blisters or erosions on the snout, lips, tongue, or inside the mouth
- Drooling or stringy saliva
- Reduced appetite or difficulty eating
- Lying down more than usual or shifting weight repeatedly
- Hoof loosening or sloughing in severe cases
- Sudden death in young piglets
When to worry: immediately. Any pig with sudden vesicles, mouth sores, or unexplained lameness should be treated as an emergency until your vet says otherwise. In the United States, vesicular disease in pigs must be taken seriously because FMD can look like other reportable diseases, and early reporting helps protect both the affected animals and nearby herds.
While some pigs show obvious snout or mouth lesions, others mainly show sore feet and reluctance to move. If you notice blisters, fresh raw skin where blisters may have ruptured, fever, drooling, or multiple pigs becoming lame at once, isolate movement on the premises and contact your vet right away.
What Causes Foot-and-Mouth Disease in Pigs?
FMD is caused by foot-and-mouth disease virus, an aphthovirus. It spreads readily among susceptible cloven-hoofed animals through direct contact, contaminated equipment, vehicles, clothing, footwear, feed-related materials, and animal products from affected regions. The first signs usually appear about 2 to 14 days after infection.
Pigs are important in outbreak planning because they can shed large amounts of virus and develop striking lesions on the feet. The virus targets tissues in and around the mouth, muzzle, teats, and feet, which is why blisters and erosions are such classic findings.
In the United States, FMD is not considered established, so any suspicious case is handled as a reportable emergency. That means the practical "cause" on a farm may involve recent animal movement, exposure to contaminated fomites, or contact with materials brought from affected areas, but the exact source requires official investigation.
It is also important to remember that several other swine diseases can mimic FMD, including Senecavirus A, swine vesicular disease, vesicular exanthema of swine, and vesicular stomatitis. That is why appearance alone cannot tell you which virus is responsible.
How Is Foot-and-Mouth Disease in Pigs Diagnosed?
FMD cannot be diagnosed reliably from signs alone. In pigs, the blisters and lameness can look very similar to other vesicular diseases, so laboratory confirmation is essential. If your vet suspects FMD or another foreign animal disease, they should immediately involve state and federal animal health officials.
Samples are typically collected from vesicular epithelium or vesicular fluid when fresh lesions are present. Depending on the case, testing may include real-time RT-PCR, virus isolation, serology, and antigen-based methods used for strain identification in approved laboratories.
Your role as a pet parent or caretaker is important. Do not move pigs on or off the property, and avoid moving trailers, boots, tools, or other items that may carry infectious material. Keep a record of recent animal movements, visitors, feed deliveries, and any travel history, because that information can help your vet and officials respond quickly.
If lesions are absent or already healing, additional sampling approaches may be used under official guidance. Because this is a herd and regulatory issue as much as a medical one, diagnosis is not only about confirming the virus. It also includes tracing contacts, assessing exposure risk, and putting immediate biosecurity steps in place.
Treatment Options for Foot-and-Mouth Disease in Pigs
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Immediate stop-movement on and off the premises
- Rapid call to your vet and state/federal animal health contacts
- Physical separation of affected and unaffected pigs as directed
- Soft bedding, easy access to water, and reduced handling while awaiting official guidance
- Basic cleaning and disinfection of nonessential traffic areas only if advised, without moving suspect animals
Recommended Standard Treatment
- Urgent on-farm veterinary assessment
- Official reporting and coordinated diagnostic sampling
- Supportive care plan directed by your vet for hydration, footing comfort, and nursing care
- Premises-level biosecurity plan for people, equipment, manure, and vehicle movement
- Monitoring of exposed pigs for fever, vesicles, appetite changes, and lameness
Advanced / Critical Care
- Intensive veterinary oversight for severely affected groups or valuable animals where allowed
- Advanced fluid and nursing support for pigs unable to eat or drink adequately
- Enhanced premises quarantine, tracing, and disinfection protocols
- Coordination with state/federal animal health teams on outbreak response options, including vaccination policy where applicable in broader control programs
- Management of severe foot damage, secondary welfare issues, and piglet losses under veterinary supervision
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Foot-and-Mouth Disease in Pigs
Bring these questions to your vet appointment to get the most out of your visit.
- Do these lesions look suspicious for a reportable vesicular disease, and who needs to be contacted right now?
- Should I stop all animal, vehicle, and visitor movement on the property until testing is complete?
- Which samples are most useful if the vesicles are fresh, and how quickly can they be submitted through official channels?
- What other diseases could look like this in pigs, such as Senecavirus A or vesicular stomatitis?
- How should I separate affected pigs and care for them safely while protecting the rest of the herd?
- What cleaning and disinfection steps are appropriate now, and what should I avoid doing before officials arrive?
- What signs mean a pig needs more intensive supportive care for pain, dehydration, or inability to stand?
- What records should I gather about recent animal movements, visitors, feed deliveries, and travel exposure?
How to Prevent Foot-and-Mouth Disease in Pigs
Prevention starts with strong biosecurity. Limit unnecessary visitors, control vehicle access, clean and disinfect boots and equipment, and avoid sharing tools between groups of pigs unless they have been properly sanitized. New or returning animals should be managed carefully according to your vet's herd-health and quarantine recommendations.
Travel and import-related precautions matter too. USDA advises against bringing prohibited animal products, contaminated clothing, or dirty footwear into the United States from affected regions. If anyone working with your pigs has traveled internationally or visited livestock facilities elsewhere, your vet can help you decide on sensible downtime and hygiene steps before they re-enter pig areas.
Early recognition is one of the most important prevention tools. Watch for fever, sudden lameness, drooling, and blisters on the feet or snout. Because pigs may show especially severe foot lesions, a group of pigs that suddenly seems sore-footed should never be brushed off as routine irritation until your vet has weighed in.
If you suspect FMD, prevention shifts to emergency containment. Stop movement immediately and contact your vet at once. Fast reporting protects your pigs, neighboring animals, and the wider livestock community.