Signs and Symptoms of Swine Foot And Mouth Disease (FDM)

Foot and mouth disease (FMD) in swine is a highly contagious infection

Foot-and-Mouth Disease (Zoonotic)

Foot and mouth disease (FMD) affects pigs of all ages and is a highly contagious infection. Pigs with FMD develop lesions, or sores, in the mucosa of their mouths. They may also develop fluid-filled blisters on their feet. Pigs will develop a fever, become lethargic, and may become lame or die.

The viral infection FMD is a zoonotic disease that can infect humans (especially young children). The virus presents as sores in the mouth and rashes on the hands and feet. If your pig becomes infected, this is a notifiable disease and must be reported to the authorities as it can spread quickly. 

Humans contract the virus by ingesting unpasteurized milk or uncooked pork. Direct contact with infected animals also passes on the virus. The United States has remained Foot and Mouth disease free since 1929.

Causes of Foot and Mouth Disease

Domestic pigs that are infected with FMD can excrete more than 1,500 times more virus as aerosols into the atmosphere than an individual cow or sheep over 24 hours. Packed piggeries are the most significant cause of FMD outbreaks, as the virus spreads quickly. 

Did you know: Your pig’s saliva contains the highest virus concentrations, which is easily passed through drinking water to other pigs. A pig’s water trough becomes a giant reservoir of the disease.

Symptoms of Foot and Mouth Disease

Foot and mouth disease causes the following symptoms in pigs:

  • Lesions or blisters on the snout, tongue, or lips
  • Foot lesions
  • Sudden lameness
  • After 24 hours, the lesions will begin to burst
  • High-grade fever
  • Chomping of jaws
  • Lethargy and depression
  • Cardiac arrest in piglets

Treating Foot and Mouth Disease

Sadly there is no effective treatment once a pig has contracted FMD. Cull infected pigs to prevent further spread of the disease. Vaccination is vital to prevent your herd from catching this virus.

Unfortunately, vaccines for pigs are short-lived and only last about six months. There are different strains of FMD; therefore, vaccines must be multivalent (several sites). Administering these vaccines can become costly to farmers when FMD becomes prevalent in their area.

The best advice is to keep in contact with local farmers and veterinarians to ensure you find out quickly if FMD is spreading in your area.


Iowa State University College of Veterinary Medicine Foot-and-Mouth Disease (FMD)

Talitha van Niekerk

Hi, I’m Talitha van Niekerk, and I made the leap to farm animal ownership when I decided to fulfil my lifelong passion to own horses. Now, over a decade later, I run a public stable facility on 180 acres of land, caring for over 75 horses of all breeds and sizes. I love to write about my experiences, sharing the knowledge I have gained and helping others achieve their life’s passion to live on the land. See my about page here.

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