CSD; Cat-scratch fever; Bartonellosis
Cat-scratch disease is an infection with bartonella bacteria. It is transmitted by cat scratches, cat bites, or flea bites.
Cat-scratch disease is caused by the bacteria Bartonella henselae. The disease is spread through contact with an infected cat (a bite or scratch) or exposure to cat fleas. It also can be spread through contact with cat saliva on broken skin or mucosal surfaces like those in the nose, mouth, and eyes.
A person who has had contact with an infected cat may show common symptoms, including:
Less common symptoms may include:
If you have swollen lymph nodes and a scratch or bite from a cat, your health care provider may suspect cat-scratch disease.
A physical exam may also reveal an enlarged spleen.
Sometimes, an infected lymph node may form a tunnel (fistula) through the skin and drain (leak fluid).
This disease is hard to diagnose, in part because it is rare. The Bartonella henselae immunofluorescence assay (IFA) blood test can detect the infection caused by these bacteria. The results of this test will be considered along with other information from your medical history, lab tests, or biopsy.
A lymph node biopsy may also be done to look for other causes of swollen glands.
Most often, cat-scratch disease is not serious. Medical treatment may not be needed. In some cases, treatment with antibiotics such as azithromycin can be helpful. Other antibiotics may be used, including:
In people with HIV/AIDS and others, who have a weak immune system, cat-scratch disease is more serious. Treatment with antibiotics may be needed.
People who have a healthy immune system should recover fully without treatment. People with a weak immune system need antibiotic treatment to recover.
People with weak immune systems may develop complications such as:
Call your provider if you have enlarged lymph nodes and you have been exposed to a cat.
To prevent cat-scratch disease:
Rolain JM, Raoult D. Bartonella infections. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 299.
Rose SR, Koehler JE. Bartonella, including cat-scratch disease. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 234.BACK TO TOP
Review Date: 9/1/2021
Reviewed By: Jatin M. Vyas, MD, PhD, Associate Professor in Medicine, Harvard Medical School; Associate in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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