Can Bartonella infection spread to humans?

Bartonella can potentially spread from animals to humans, usually through flea exposure or bites. Immunocompromised individuals should be especially cautious. If concerned, consult a medical or veterinary professional.

How is Bartonella infection diagnosed in dogs and cats?

Common methods include serology and PCR testing to detect Bartonella DNA. Your vet will determine the appropriate tests based on your pet's history and clinical signs, and explain the results.

How long does treatment for Bartonella infection take?

Treatment typically involves an extended antibiotic course. Recovery time varies by individual and disease severity, and often takes weeks to months, with regular check-ups and lab monitoring required.

How can I reduce the risk of Bartonella infection?

Consistent flea prevention, maintaining a clean environment, and regular health check-ups can lower the risk. If your pet has contact with wildlife or flea exposure, discuss protective measures with your vet.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Bartonella Infection in Dogs & Cats: Lethargy, Testing & Treatment Guide [2025]

Bartonella is a flea-borne bacterial infection that can affect the heart and nervous system, requiring a long course of antibiotic treatment.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: AVMA, ISFM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•High fever persisting for more than 24 hours without improvement
•Sudden onset of seizures or prolonged loss of consciousness
•Inability to stand normally or significant difficulty breathing

Schedule a Clinic Visit Soon (within 24–72 hours)

•Noticeably reduced appetite lasting more than two meals
•Intermittent seizures or muscle tremors
•Irregular heartbeat or sustained rapid heart rate

01What symptoms indicate something is wrong?

Bartonella infection often affects the whole body and cardiovascular system, presenting with a wide range of signs that can easily be mistaken for other conditions.

Lethargy, excessive sleepiness, or a noticeable drop in activity level
Weakness and low energy, with difficulty standing or jumping
Recurring or unexplained fever with fluctuating body temperature
Seizures, muscle tremors, or other neurological abnormalities
Unsteady gait or visible wobbling when walking
Irregular heartbeat, or noticeable changes in heart rate (too fast or too slow)
Schedule a veterinary visit promptly if symptoms persist or worsen

Seek emergency care immediately if you notice the following symptoms:

⚠️ Seek immediate veterinary care if your pet has a persistently high fever or neurological symptoms

02How to assess abnormalities at home? Key observations and emergency warning signs

Keeping a record of key observations at home helps your vet quickly assess your pet's condition and how it is progressing.

Record your pet's alertness and activity level daily (note any lethargy)
Take and log body temperature at regular intervals, noting the time and reading
Monitor for any changes in appetite, food intake, and water consumption
Track urination and defecation frequency and note any changes in color or consistency
Weigh your pet weekly and track any changes to monitor nutritional status
Seek emergency veterinary care immediately if temperature or symptoms suddenly worsen

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, the vet will combine a physical examination with laboratory tests to assess infection severity and risk of complications.

Complete physical examination

assessing overall condition and cardiovascular function

Blood work

including complete blood count, liver and kidney markers, and inflammatory indicators

Serology

testing for antibody response against Bartonella

PCR testing

detecting Bartonella DNA to improve diagnostic accuracy

Bacterial culture

to rule out or confirm co-infection

Cardiac imaging (ultrasound) or advanced imaging if indicated

Seek a specialist clinic or a well-equipped hospital capable of performing PCR testing

04What treatment and care are needed after diagnosis? Medication, diet, and home care guide

Treatment primarily involves a prolonged course of antibiotics, with regular follow-up of clinical signs and lab results; good home care supports recovery.

Complete the full antibiotic course as directed by your vet — do not stop the medication early
Attend regular check-ups to monitor clinical signs and blood test results
Schedule follow-up serology or PCR tests to evaluate treatment response
Adjust diet as needed and ensure adequate nutrition and hydration
Provide a quiet resting environment at home and avoid over-exertion
Arrange cardiology follow-up if abnormal heart rhythm or breathing is observed
Schedule ongoing follow-up and any necessary tests at a specialist clinic

05What should you prepare before the vet visit? Key information to help your vet quickly identify the cause

Note the onset date and how symptoms have evolved over time

Bring a record of appetite and water intake from the past week

Prepare notes on urination and defecation frequency and any changes observed

List all current medications and supplements your pet is taking

Bring any previous test reports or imaging results to the appointment

Call ahead to book an appointment and mention the tests that may be needed

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.