Definition of Cat scratch disease:

Cat scratch disease is an infectious illness caused by the bacteria bartonella. It is believed to be transmitted by cat scratches, bites, or exposure to cat saliva.

Causes, incidence, and risk factors:

Cat scratch disease is caused by Bartonella henselae. The disease is spread through contact with an infected cat (a bite or scratch), or contact with cat saliva on broken skin or the white of the eye.

About 2 - 3 weeks after becoming infection, lymph nodes swelling (lymphadenopathy) occurs near the site of the scratch or bite.

Occasionally, an infected lymph node may form a tunnel (fistula) through the skin and drain. Cat scratch disease is a common causes of chronic lymph node swelling in children.