Blackleg Apr 2026

Blackleg: Frequently Asked Questions | Ohio BEEF Cattle Letter

Blackleg (also known as "black quarter" or "quarter ill") is a highly fatal, non-contagious bacterial disease that primarily affects young, healthy cattle and sheep. It is known for its rapid progression, often resulting in sudden death within 12 to 48 hours.

: As the bacteria multiply, they release gas that builds up under the skin, creating a "crackling" sound (like bubble wrap) when pressed.

: Livestock typically ingest the spores while grazing. The spores then enter the bloodstream and lodge in muscle tissue, where they can remain dormant for months or years. Symptoms and "Black Leg"

: Characterized by heat and pain, typically in the hindquarters, shoulders, or neck.

In many cases, the first sign of blackleg is finding a deceased animal. If signs are caught early, they may include:

Because treatment is rarely successful—due to how quickly the toxin works—prevention is the only reliable defense.

The disease is primarily caused by , a gram-positive, spore-forming bacterium.