🦠microbiology review

Cat-scratch disease (CSD)

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

Cat-scratch disease (CSD) is a bacterial infection caused by Bartonella henselae, typically transmitted through scratches or bites from infected cats. Symptoms include swelling of lymph nodes near the site of injury, fever, and fatigue.

5 Must Know Facts For Your Next Test

  1. CSD primarily affects the lymphatic system, leading to swollen and tender lymph nodes.
  2. The causative agent is Bartonella henselae, a gram-negative bacterium.
  3. Diagnosis often involves serological tests to detect antibodies against Bartonella henselae.
  4. Most cases are self-limiting and resolve without specific treatment, though antibiotics may be prescribed in severe cases.
  5. Cats, especially kittens, are common carriers of Bartonella henselae bacteria.

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