What should you know about swine erysipelas in pigs?

Erysipelothrix rhusiopathiae can persist in the environment and spread among pigs through contaminated material. The acute form may cause fever, weakness, reluctance to move and sudden deaths. Raised, red or purple diamond-shaped skin patches are a classic sign, but they may be absent.

Other forms can cause swollen joints, lameness and poor growth. Breeding animals may develop reproductive problems. The signs can resemble other infections or toxic conditions, so a veterinarian may need an examination and laboratory testing to confirm the cause.

Separate sick pigs where practical, limit movement between groups and contact a veterinarian promptly. Record which animals are affected, when signs began and any recent changes in feed, housing or introductions. Use dedicated equipment and follow cleaning and disinfection instructions.

Antibiotic treatment may be effective when started early, but the medicine, route and duration must be chosen by a veterinarian for the animals and local rules. Discuss vaccination and herd-level prevention, including control of carriers and safe handling of carcasses. People handling sick pigs should use protective clothing and cover cuts because the organism can infect humans.

Contact a veterinarian immediately when several pigs become febrile or weak, when purple skin patches appear, when lameness spreads through a group, or when unexplained deaths occur. Do not wait for a rash before seeking advice, since sudden disease can progress before skin signs are visible.

Ask which samples are needed, whether treatment should begin before results, how to isolate affected pigs and whether the herd needs vaccination. Confirm medicine withdrawal instructions, carcass handling and the steps needed to protect farm workers.