Identifying and Treating Leptospirosis In Pigs

Leptospirosis in pigs causes abortions, stillbirths, and reproductive issues

Leptospirosis: Reproductive Illness (Zoonotic) 

Leptospirosis is a common bacterial disease that causes abortions, stillbirths, and reproductive issues in pigs. It is caused by spirochaetes (a group of spiral-shaped bacteria). Leptospirosis occurs mainly in adult pigs. Sadly within 1 to 4 weeks after infection with the bacteria, a pig can experience abortion or the birth of weak piglets that die soon after birth.

Pregnant sows are at high risk for this disease. The bacteria enter the body through the pig’s mucous membranes and cause infection within the uterus. 

Pig Leptospirosis is zoonotic, which means it can spread to humans, domestic animals, and wildlife. It causes serious diseases such as Lyme disease and syphilis in humans (study below). It can also cause symptoms similar to the flu: fever, headaches, sore muscles, chills, and vomiting. So take extreme care to handle infected pigs with gloves and wash your hands immediately!

Causes of Leptospirosis

Infected or carrier pigs shed the organisms in their urine, which can spread quickly to the rest of the herd. Leptospirosis spreads through contaminated food or water. 

Humans are infected by consuming uncooked pork products, drinking contaminated water, or handling carrier pigs. The bacteria spread through the air from the urine droplets of infected pigs. So cover your nose and mouth with an N95 mask when working with ill pigs.

Symptoms of Leptospirosis 

If your pig is infected, it will show signs of anorexia, fever, and lack of energy. If your piglets are infected, they show signs of jaundice (although it is rare for piglets to be infected). 

If your pigs are experiencing stillbirth or giving birth to weak piglets (also known as squeakers), they may be infected. Symptoms of Leptospirosis in Pigs include:

  • Stillbirths
  • Weak piglets
  • Loss of appetite
  • Mild diarrhea
  • Weight loss 

Treating Leptospirosis 

Administer oral antibiotics as soon as possible to prevent further spread of the bacteria. Blood transfusions may also be necessary in severe cases.

Have your pigs vaccinated with a multivalent bacterin (such as Lepto-Eryvac) every six months as a preventative? Make sure there are no rats in your pig’s living environment, as they are also carriers of this disease. Secure pig feeds to prevent attracting rats.

Ensure your pigs have access to clean water. Disinfect the pigs living area regularly with products that contain sodium hypochlorite. Unfortunately, no confirmed safe vaccine is available for humans yet, so preventing human infection is vital.


National Library of Medicine Leptospirosis: The “mysterious” mimic

Queensland Government Leptospirosis in pigs

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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