What it looks like
- The chest swelling
- A firm, painful swelling low on the chest — the classic presentation — or along the belly, in the armpit, or around the udder or sheath. What you’re feeling is a deep abscess forming under the skin.
- Fever and soreness
- Many horses run a fever, move stiffly, or go off feed while the abscess develops.
- The leg form
- Less often, the bacteria inflame the lymphatics of a leg — ulcerative lymphangitis — with swelling, oozing sores, and lameness. That form needs prompt treatment, not patience.
- Internal abscesses
- Rare but serious: abscesses inside the abdomen or chest, showing up weeks later as weight loss, recurring fever, or a horse that just isn’t right. They don’t announce themselves — they have to be hunted, with bloodwork and ultrasound.
How it spreads
- Flies do the carrying
- Horn flies and stable flies move the bacteria from drainage and contaminated ground to the next horse’s skin break. Heavy fly pressure is the engine of an outbreak.
- Drainage is contagious
- Pus from a draining abscess is loaded with bacteria. Isolate a horse that’s draining, don’t share brushes, blankets, or tack with it, and disinfect what touches it.
- It lives in the ground
- The bacteria persist in soil, so a farm that has had pigeon fever one year can see it again the next. Fly control and cleanup after a case are the real long-term answers.
Abscess care — patience, then drainage
- Don’t rush it
- An immature abscess shouldn’t be opened. Hot packs or a poultice help it come to a head, and ultrasound tells us when it’s ripe — guessing wrong makes a bigger mess and a longer recovery.
- Lancing and flushing
- Once it’s ready, we open and drain it, and then it’s flushed daily with dilute antiseptic until it heals from the inside out. Most external abscesses do well with drainage and nursing care.
- Antibiotics — usually not for the simple case
- Antibiotics penetrate a mature abscess wall poorly, so they’re generally reserved for internal abscesses, the leg form, or horses that are systemically ill. That decision is the veterinarian’s, made case by case.
- Fly control is treatment
- A draining horse is fly bait, and flies close the loop to the next horse. Fly spray, sheets, and prompt cleanup of drainage are part of the prescription, not an afterthought.
Pigeon feverAbscess careFly controlUltrasoundCorynebacterium pseudotuberculosis
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