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Vetdle Archive

Archive Case #75: Bovine Blackleg

Cattle veterinary case - Medium - May 17, 2026

Clinical Clues

  1. A rapidly growing young beef animal is found acutely lame and depressed on pasture.
  2. A hot painful swelling is present high in the hindlimb musculature.
  3. The tissue becomes crepitant as the case progresses.
  4. Fever and rapid deterioration are noted despite no obvious penetrating injury.
  5. The pattern is consistent with clostridial myositis in an unprotected animal.
  6. Blackleg is a peracute bacterial muscle disease of young cattle that often leads to sudden death.

Diagnosis

Bovine Blackleg

This case is most consistent with Bovine Blackleg because the calf has acute painful muscle swelling with gas formation and rapid systemic decline. The most important clues are the crepitus and young grazing animal signalment, which strongly support clostridial myositis.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this cattle case supports the provided diagnosis, Bovine Blackleg, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: A rapidly growing young beef animal is found acutely lame and depressed on pasture.
  2. Clue 2: A hot painful swelling is present high in the hindlimb musculature.

Clues 3-4

  1. Clue 3: The tissue becomes crepitant as the case progresses.
  2. Clue 4: Fever and rapid deterioration are noted despite no obvious penetrating injury.

Clues 5-6

  1. Clue 5: The pattern is consistent with clostridial myositis in an unprotected animal.
  2. Clue 6: Blackleg is a peracute bacterial muscle disease of young cattle that often leads to sudden death.

Self-review prompts

  1. After clues 1-2, what evidence from this cattle case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Bovine Blackleg?
  3. How do clues 5-6 align with the case explanation for Bovine Blackleg?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.