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Cat-scratch disease

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.

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Cat scratch disease
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Causes

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.

Symptoms

A person who has had contact with an infected cat may show common symptoms, including:

Less common symptoms may include:

Exams and Tests

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.

Treatment

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.

Outlook (Prognosis)

People who have a healthy immune system should recover fully without treatment. People with a weak immune system need antibiotic treatment to recover.

Possible Complications

People with weak immune systems may develop complications such as:

When to Contact a Medical Professional

Call your provider if you have enlarged lymph nodes and you have been exposed to a cat.

Prevention

To prevent cat-scratch disease:

Related Information

Lymphofollicular hyperplasia
Conjunctiva
Swollen lymph nodes
Fistula
Chronic
Parinaud oculoglandular syndrome
Neuroretinitis
Osteomyelitis

References

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.

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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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