Illustrated identification guide — PestControlBasics.com
🔍 Identification
Cat scratch disease (CSD): bacterial infection from Bartonella henselae, transmitted when flea dirt (dried flea feces containing bacteria) on a cat's claws or saliva enters a scratch wound. Symptoms: swollen lymph node near the scratch site, fever, fatigue — resolves in 2-4 months. Severe forms: encephalitis, bacillary angiomatosis (in immunocompromised individuals). Cats are asymptomatic carriers — they're infected by fleas and don't show disease signs.
🧬 Biology & Behavior
The transmission chain: Fleas feed on Bartonella-infected cats → flea feces contain Bartonella → feces contaminate cat fur and claws → cat scratches human → bacteria enter wound. Cats are not themselves sick and not directly contagious. The prevention solution is flea control on the cat, not avoiding cats or preventing all scratches.
⚠️ Damage & Health Risk
Bartonella infection causing lymph node swelling, fever, and fatigue; severe complications in immunocompromised individuals; rarely, ocular, neurological, or systemic complications.
🔧 DIY Treatment
Year-round veterinary flea control on cats (Revolution Plus, Bravecto) reduces the flea burden that transmits Bartonella to cats. Wash hands after handling cats. Clean scratches promptly with soap and water. Immunocompromised individuals should consult their physician about cat interaction precautions.
👷 When to Call a Pro
Veterinary prescription flea prevention is the most effective disease prevention measure — not avoiding cats.