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PubMed This is a summary of 25 peer-reviewed journal articles Updated
Pediatrics

Symptoms & Timeline

At a Glance

Cat-scratch disease symptoms develop slowly over weeks. A small bump appears at the scratch site within 3 to 10 days, followed by swollen, tender lymph nodes 1 to 3 weeks later. While usually mild, contact a doctor immediately for vision changes, prolonged fever, or severe headaches.

Monitoring the symptoms of Cat-scratch disease (CSD) requires a bit of detective work, as the signs appear in stages rather than all at once. Because the bacteria move through the body’s lymphatic system—the network that helps fight infection—the symptoms follow a relatively predictable, though slow, timeline [1][2].

The Typical Timeline

The progression of CSD is measured in weeks, not days. Understanding this pace can help you track whether the infection is following a standard path.

1. The Inoculation Site (Days 3 to 10)

Shortly after a scratch or bite, a small papule (a solid, raised bump) or pustule (a small blister) often develops at the site of the injury [3][4].

  • This bump is often mistaken for a bug bite or a small pimple [5].
  • It is the first sign that the bacteria have entered the skin [6].

2. Regional Lymphadenopathy (Weeks 1 to 3)

The most common hallmark of CSD is the swelling of lymph nodes near the original scratch [3]. For example, a scratch on the hand will usually lead to swelling in the elbow or armpit [1].

  • Duration: Swelling typically peaks within a few weeks but can persist for 2 to 8 weeks or longer [7][8].
  • Sensation: The nodes may feel tender, warm, or firm to the touch [9].
  • Home Comfort: Applying a gentle, warm compress to the swollen node can help relieve discomfort.

3. “Feeling Sick” (Systemic Symptoms)

About 30% to 50% of patients develop mild symptoms that affect the whole body [3][9].

  • Fever: Often mild, but can be persistent [10].
  • Malaise and Fatigue: A general feeling of discomfort or unusual tiredness [11][12].
  • Appetite Loss: Children may be less interested in eating than usual [12].

Red Flags: When to Call the Doctor

In a small number of cases (about 5-20%), the bacteria can spread beyond the local lymph nodes [13]. Contact your care team if you notice any of these signs.

Ocular (Eye) Warning Signs

CSD can affect the eyes, though the severity varies:

  • Parinaud Oculoglandular Syndrome (POGS): This affects about 5% of patients and looks like severe pink eye with a swollen lymph node near the ear [14][15]. While alarming, it is generally less severe and often resolves with standard care [16].
  • Neuroretinitis (Rare, 1-2%): A more serious condition involving inflammation of the optic nerve [17]. Watch for blurred vision, “blind spots,” or sudden vision changes in one eye [18][19].

Neurological Warning Signs

In very rare cases (less than 1%), CSD can lead to encephalopathy (brain involvement) [20]. Warning signs include:

  • Severe Headache: Intensely painful and unrelenting [21].
  • Altered Mental Status: Confusion, extreme irritability, or acting out of character [21][22].
  • Coordination Issues: Any sudden loss of muscle control or unusual lethargy [21].

Prolonged Systemic Signs

  • High or Lasting Fever: A fever that lasts more than 7 to 10 days [23][24].
  • Bone or Joint Pain: Deep, aching pain in the bones, which occurs in less than 1% of cases but requires attention [25][23].

Common questions in this guide

How long does it take for cat-scratch disease symptoms to appear?
The first sign is typically a small bump or blister at the scratch site within 3 to 10 days. Swollen lymph nodes usually develop 1 to 3 weeks after the initial injury.
What should I watch for in my child's vision after a cat scratch?
Watch for redness, swelling near the ear, blurred vision, blind spots, or sudden vision changes. These can be signs of rare eye complications like Parinaud Oculoglandular Syndrome or neuroretinitis that need immediate medical attention.
How long is it normal to have a fever with cat-scratch disease?
A mild fever can be a normal part of the infection. However, if the fever is high or lasts for more than 7 to 10 days, you should contact your doctor for further evaluation.
Will the swollen lymph nodes from cat-scratch disease go away?
Yes, but it takes time. The swelling usually peaks within a few weeks, but the lymph nodes can remain enlarged and tender for 2 to 8 weeks or even longer before fully resolving.
When does a headache become a warning sign of something serious?
If a headache becomes intensely painful and unrelenting, it could be a very rare sign of brain involvement. Seek immediate medical care if severe headaches are accompanied by confusion, unusual irritability, or loss of coordination.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on the current size and location of the lymph nodes, is this following the expected timeline for CSD?
  2. 2.What specific changes in my child's vision should I be looking for that would require an immediate call to an ophthalmologist?
  3. 3.When is it safe for my child to return to school, sports, or other physical activities?
  4. 4.How many days of fever should we consider 'normal' for this infection before it becomes a 'red flag'?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (25)
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    Diagnosis and interpretation of testing for cat scratch disease.

    Khalfe N, Lin D

    Proceedings (Baylor University. Medical Center) 2022; (35(1)):68-69 doi:10.1080/08998280.2021.1984791.

    PMID: 34970038
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    Cat scratch disease in 9-year-old patient - a case report.

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    Polski przeglad chirurgiczny 2016; (88(2)):109-12.

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    Seasonality of Bartonella henselae IgM and IgG Antibody Positivity Rates.

    Theel ES, Ross T

    Journal of clinical microbiology 2019; (57(12)) doi:10.1128/JCM.01263-19.

    PMID: 31533982
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    Molecular Diagnosis of Cat Scratch Disease: a 25-Year Retrospective Comparative Analysis of Various Clinical Specimens and Different PCR Assays.

    Goaz S, Rasis M, Binsky Ehrenreich I, et al.

    Microbiology spectrum 2022; (10(2)):e0259621 doi:10.1128/spectrum.02596-21.

    PMID: 35262411
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    Abnormal Presentation of Bartonella henselae Encephalopathy in a Pediatric Patient.

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    A pediatric case with peripheral facial nerve palsy caused by a granulomatous lesion associated with cat scratch disease.

    Nakamura C, Inaba Y, Tsukahara K, et al.

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    A Case of Atypical Bartonellosis in a 4-Year-Old Immunocompetent Child.

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    Cat Scratch Disease: 9 Years of Experience at a Pediatric Center.

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    Cerebral venous sinus thrombosis and skull base osteomyelitis as manifestations of cat-scratch disease in a pediatric patient: A case report and literature review.

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    [Bartonella henselae myositis: case report in an adolescent].

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    Atypical Manifestations of Cat-Scratch Disease, United States, 2005-2014.

    Nawrocki CC, Max RJ, Marzec NS, Nelson CA

    Emerging infectious diseases 2020; (26(7)):1438-1446 doi:10.3201/eid2607.200034.

    PMID: 32568056
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    Posterior Segment Manifestations of Cat-scratch Disease: A Mini-review of the Clinical and Multi-modal Imaging Features.

    Karti O, Ataş F, Saatci AO

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    Cat-scratch Disease with Parinaud's Oculoglandular Syndrome.

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    Francisella tularensis Infection Causing Parinaud Oculoglandular Syndrome.

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    A challenging differential diagnosis of optic neuropathy in ED: CSD.

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    Child Neurology: Bartonella henselae Neuroretinitis in 2 Patients.

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    PMID: 35351795
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    The development and spontaneous resolution of a full-thickness macular hole in bartonella henselae neuroretinitis in a 12-year-old boy.

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    Hepatosplenic Cat Scratch Disease and Prolonged Fever: When To Add Corticosteroids?

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This page provides a general timeline of Cat-scratch disease symptoms for educational purposes only. Always consult a healthcare provider to evaluate swollen lymph nodes, prolonged fever, or sudden vision changes.

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