Cat scratch disease: the swollen glands after a cat scratch
Last updated September 3, 2026.
Cat scratch disease is the bacterial infection (the Bartonella) passed by the cat scratches, the bites, or the licks: the small bump at the scratch site, followed weeks later by the swollen, tender lymph nodes near it, usually with the mild fever and the fatigue. It is common (the children and the cat owners the most), it usually clears on its own over the weeks-to-months, and only the severe-or-unusual kind needs the antibiotics.
What does it look like?
The sequence: the scratch-or-bite (often from the kitten: the playful, not the aggressive), the small raised bump-or-pustule at the site within the 3-to-10 days (often dismissed as the insect bite), then the 1-to-3 weeks later: the lymph nodes near the scratch swelling up (the armpit for the hand scratches, the neck for the face ones: the tender, sometimes the large), with the low fever, the fatigue, the headache, and the poor appetite. The nodes can stay swollen for the weeks-to-months, and occasionally one turns into the small abscess that drains.
Who gets it, and how?
The cats carry the Bartonella bacteria (the flea-spread among them: the kittens and the strays carry it most), the people catch it through the scratches, the bites, or the cat licking the broken skin, and it does not spread person-to-person. The cat itself looks completely healthy. The young cats, the outdoor cats, and the flea-carrying cats are the main sources, and the rough play with the kittens is the classic exposure.
How is it diagnosed and treated?
- The diagnosis: the story (the cat exposure, the site bump, the nearby swollen nodes) plus the examination; the blood test confirms when needed, and the other-causes checks happen when the picture is atypical.
- The usual treatment is none: the healthy immune system clears it over the 2-to-4 months, with the warm compresses and the acetaminophen-or-ibuprofen for the discomfort.
- The antibiotics for the minority: the severe, the widespread, or the immunocompromised kind (and the unusual complications: the eye, the liver, the nervous system).
- The node that will not quit: the node persisting or enlarging past the expected months gets the re-review (the biopsy occasionally, to be certain).
When does it need the prompt care?
The prompt review for: the high or the persistent fever, the vision changes or the eye redness, the severe headache or the confusion, the widespread joint pain, or anyone immunocompromised (the HIV, the transplant, the chemotherapy) with the cat-scratch exposure. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Do I need antibiotics?
Usually not: the healthy immune system clears the Bartonella on its own (the course is the weeks-to-months: slow but complete), and the antibiotics are reserved for the severe cases, the immunocompromised, and the unusual complications (the eye, the liver, the nervous-system kinds). The mainstays for the ordinary kind are the warm compresses, the acetaminophen-or-ibuprofen, and the patience.
Is it contagious? Can I give it to my family?
No: it does not spread person-to-person (the only route is the cat-to-human through the scratch, the bite, or the lick on the broken skin). Your family's only risk is the same cat (the same rule: the gentle play, the scratches washed promptly), not you.
The kitten seems perfectly healthy. How is that possible?
Normal: the cats carrying the Bartonella show no illness at all (they are the silent carriers, especially the kittens and the strays, picking it up from the fleas), so the healthy-looking kitten is exactly the expected source. The cat needs nothing done to it: the flea control reduces its chance of carrying, and that is the whole cat-side story.
How long will the swollen gland last?
Longer than feels fair: the node typically stays swollen for the weeks, sometimes the 2-to-4 months (the slow resolution is the norm, not the alarm), and occasionally one forms the small abscess that drains. The reasons to go back before then: the high-or-persistent fever, the node enlarging rather than slowly shrinking, or the redness-and-worsening-pain over it.
Should I get rid of the cat?
No: the rehoming is not the recommendation (the bond matters, and the next cat can carry the same bacteria), and the prevention is the handling style: the rough play that invites the scratches redirected to the toys, the scratches washed promptly with the soap-and-water, the flea control kept current, and the immunocompromised households advised toward the adult cats over the kittens (the calmer, the lower-carriage).
Could the swollen gland be something more serious?
The story makes it unlikely (the scratch-then-site-bump-then-nearby-node sequence is the signature), and the doctor's once-over exists to exclude the alternatives: the persistent unexplained node (the weeks of the growth without the cat story), the rock-hard fixed node, or the night-sweats-and-weight-loss company would each get the different workup. Your combination points to the cat scratch, and the confirmation visit makes it official.