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Jacksonville Disease (Bartonella Infection) – A Patient‑Friendly Medical Guide

Overview

Jacksonville disease is a colloquial term that has been used in some clinical literature to describe a subset of chronic Bartonella infections that present with prolonged, multisystem symptoms. The name originates from early case series reported by researchers at the University of North Florida in Jacksonville, Florida. In scientific terminology the condition is simply a Bartonella spp. infection, most commonly caused by Bartonella henselae (the agent of cat‑scratch disease) or Bartonella quintana (the agent of trench fever).

Anyone can become infected, but certain groups are at higher risk:

• People with frequent exposure to cats, especially kittens, or to cat fleas.
• Individuals who are homeless or live in crowded conditions where body lice thrive (a known vector for B. quintana).
• Immunocompromised patients, including those with HIV/AIDS, organ‑transplant recipients, or patients on long‑term corticosteroids.
• Veterinarians, animal shelter workers, and laboratory personnel handling rodents or arthropods.

While exact prevalence data are limited because the infection is often under‑diagnosed, the CDC estimates that approximately 12,000–15,000 cases of cat‑scratch disease are reported annually in the United States, and seroprevalence studies suggest up to 5 % of the general population may have been exposed to Bartonella spp. Chronic, “Jacksonville‑type” disease likely represents a small fraction of these infections, but it is increasingly recognized in specialty clinics.

Symptoms

Symptoms can be intermittent and vary widely between individuals. The list below includes both acute and chronic manifestations that have been reported in the medical literature.

General / Constitutional

• Fever or low‑grade fever – often fluctuating, lasting weeks to months.
• Fatigue / profound exhaustion – not relieved by rest.
• Night sweats – may be drenching.
• Weight loss – usually unintentional.

Dermatologic

• Red or purple skin nodules (bacillary angiomatosis) in immunocompromised patients.
• Ulcerative or vesicular lesions at sites of cat scratches or bites.
• “**Molluscum‑like papules**” on the trunk or extremities.

Neurologic / Psychiatric

• Headache – often described as “pressure‑like.”
• Memory problems, brain fog, and difficulty concentrating.
• Peripheral neuropathy – numbness or tingling in hands and feet.
• Depression, anxiety, or mood swings (documented in chronic cases).

Cardiovascular / Vascular

• Myocarditis or endocarditis (rare, usually in patients with pre‑existing heart valve disease).
• Enlarged lymph nodes (lymphadenopathy) that may feel tender.
• Vasculitic lesions – small‑vessel inflammation causing purpura or petechiae.

Musculoskeletal

• Arthralgia – joint pain without swelling.
• Myalgia – muscle aches, often worse after activity.
• Occasional joint swelling in the knees, ankles, or wrists.

Ocular

• Conjunctivitis or uveitis (inflammation of the eye); may cause redness and light sensitivity.

Gastrointestinal

• Nausea, abdominal pain, or intermittent diarrhea.

Because the symptom picture mimics many other conditions (Lyme disease, autoimmune disorders, viral infections), a high index of suspicion and appropriate testing are essential.

Causes and Risk Factors

Microbial Etiology

Bartonella are gram‑negative, intracellular bacteria that survive inside endothelial cells and erythrocytes. The most common species implicated in human disease are:

• Bartonella henselae – transmitted primarily by cat fleas (Ctenocephalides felis) and scratches/bites from infected cats.
• Bartonella quintana – transmitted by human body lice (Pediculus humanus corporis), historically known for causing trench fever during WWI.
• Less common species (B. bacilliformis, B. clarridgeiae) cause disease in specific geographic regions.

How Infection Occurs

1. Cat exposure: A cat flea bites an infected cat, then bites a human or contaminates a scratch wound with infected flea feces.
2. Louse exposure: Body lice ingest bacteria while feeding; later, when lice are crushed on the skin, the organisms can enter through micro‑abrasions.
3. Blood transfusion or organ transplantation: Rare but documented cases of transmission.

Risk Factors

• Frequent contact with kittens or stray cats.
• Living in areas with high flea burdens (warm, humid climates).
• Homelessness, crowded shelter living, or poor hygiene (promotes lice infestation).
• Immunosuppression – HIV infection, chemotherapy, long‑term steroids.
• Travel to endemic regions (e.g., parts of South America where B. bacilliformis causes “Oroya fever”).

Diagnosis

Diagnosing Bartonella infection can be challenging because the bacteria are fastidious and may not grow well in routine cultures. A combination of clinical suspicion, exposure history, and specialized testing is required.

Laboratory Tests

• Serology (IgG/IgM antibodies) – Enzyme‑linked immunosorbent assay (ELISA) or indirect immunofluorescence assay (IFA). A rise in titer of ≥4‑fold between acute and convalescent samples supports infection.
• Polymerase chain reaction (PCR) – Detects Bartonella DNA in blood, tissue biopsy, or body fluids. PCR is highly specific but may be negative if bacterial load is low.
• Blood culture (BAPGM enrichment) – The Bartonella Alpha‑Proteobacteria Growth Medium (BAPGM) increases the likelihood of isolating the organism; usually performed in reference labs.
• Complete blood count (CBC) and inflammatory markers – May show mild anemia, thrombocytopenia, or elevated ESR/CRP, but these findings are nonspecific.
• Imaging – Ultrasound or CT may be ordered to evaluate unexplained lymphadenopathy or organ‑specific disease (e.g., hepatic lesions).

Diagnostic Criteria (Practical Approach)

1. Compatible clinical syndrome (fever, fatigue, lymphadenopathy, or skin lesions).
2. Documented exposure to a known vector (cat/flea, body lice) or occupational risk.
3. Positive serology (IgG ≥1:256) OR PCR positivity from a relevant specimen.
4. Exclusion of other more common causes (e.g., Lyme disease, viral infections).

Why Diagnosis Is Often Missed

Traditional bacterial cultures rarely grow Bartonella, and many primary‑care labs do not offer Bartonella PCR or the specialized BAPGM method. Consequently, patients may undergo extensive work‑ups before the correct diagnosis is reached, sometimes taking years.

Treatment Options

There is no single “gold‑standard” regimen, and therapy is tailored to the species, disease severity, and patient’s immune status. Treatment durations are longer than for typical bacterial infections because Bartonella persists intracellularly.

First‑Line Antibiotics

Drug	Typical Dose (Adults)	Duration	Notes
Doxycycline	100 mg PO twice daily	4–6 weeks (often 8 weeks for chronic disease)	Preferred for most cases; contraindicated in pregnancy.
Azithromycin	500 mg PO once daily	5 days then weekly for 4 weeks (alternative)	Useful in children or doxycycline‑intolerant patients.
Rifampin	300 mg PO twice daily	4–6 weeks (often added to doxycycline)	Synergistic; monitor liver enzymes.

Combination Therapy for Severe or Immunocompromised Cases

• Doxycycline + Rifampin + Gentamicin (IV, 5‑7 days) – used for endocarditis or bacillary angiomatosis.
• Doxycycline + Azithromycin – an oral regimen for prolonged therapy when IV access isn’t feasible.

Adjunctive Measures

• Fever control: Acetaminophen or ibuprofen as needed.
• Anti‑inflammatory agents: Low‑dose steroids may be considered for severe vasculitis, but only under specialist supervision.
• Supportive care: Hydration, balanced nutrition, and rest.

Monitoring & Follow‑up

Repeat serology or PCR after 4–6 weeks of therapy can help confirm microbiologic response. Clinically, improvement in fatigue, fever, and skin lesions within 2–3 weeks is a good indicator.

Special Populations

• Pregnant women: Azithromycin is the preferred agent; doxycycline is avoided.
• Children < 8 years: Azithromycin or trimethoprim‑sulfamethoxazole (TMP‑SMX) is commonly used.
• Renal/hepatic impairment: Dose adjustments of doxycycline and rifampin may be required.

Living with Jacksonville Disease (Bartonella Infection)

Managing a chronic Bartonella infection involves more than medication; lifestyle adjustments and regular medical oversight improve outcomes.

Daily Management Tips

• Medication adherence: Set alarms or use a pill‑box; incomplete courses increase relapse risk.
• Hydration & nutrition: Aim for 2‑3 L of water daily; include protein‑rich foods to support immune recovery.
• Energy pacing: Adopt the “rest‑activity‑rest” model—short bursts of activity followed by rest to avoid crashes.
• Sleep hygiene: Maintain a consistent bedtime, dark bedroom, and limit caffeine after 2 pm.
• Skin care: Inspect lesions daily, keep them clean, and seek prompt care for new ulcers or worsening redness.
• Stress management: Mindfulness, gentle yoga, or breathing exercises can lessen fatigue‑related brain fog.
• Regular follow‑up: Schedule appointments every 4–6 weeks during treatment, then every 3–6 months after resolution.

Support Resources

Connecting with patient advocacy groups such as the Bartonella Research Foundation or local chronic‑illness support circles can reduce isolation and provide up‑to‑date information.

Prevention

Because the primary vectors are cats (and their fleas) and body lice, prevention focuses on vector control and personal hygiene.

For Cat Owners

• Keep cats indoors whenever possible to reduce flea exposure.
• Use veterinarian‑approved flea control (e.g., spot‑on treatments, oral isoxazoline products) monthly.
• Avoid rough play that could cause scratches; wear long sleeves and gloves when handling kittens.
• Wash any cat scratches or bites with soap and water immediately; apply antiseptic.

For Individuals at Risk of Louse Infestation

• Maintain personal hygiene; change and wash clothing regularly.
• Use lice‑killing shampoos or powders if an infestation is suspected.
• Seek shelter assistance programs that provide clean bedding and laundry services.

General Measures

• Promptly treat any fever of unknown origin with a clinician aware of Bartonella.
• Consider prophylactic doxycycline (100 mg PO daily) for high‑risk individuals during outbreak seasons, but only after medical advice.
• Practice safe handling of animal tissue if you work in a veterinary or laboratory setting (gloves, goggles).

Complications

When left untreated, Bartonella infection can progress to serious, sometimes life‑threatening conditions.

• Bacillary angiomatosis: Vascular skin lesions that can bleed heavily.
• Endocarditis: Infection of heart valves, presenting with murmur, embolic strokes, or heart failure.
• Neuro‑Bartonellosis: Encephalitis, seizures, or peripheral neuropathy.
• Hepatosplenic involvement: Granulomas in liver or spleen leading to abdominal pain.
• Persistent bacteremia: May predispose to secondary bacterial infections.

Early recognition and treatment dramatically reduce the risk of these outcomes.

When to Seek Emergency Care

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Sources: Mayo Clinic. “Bartonella (cat‑scratch disease).” 2023.
Centers for Disease Control and Prevention (CDC). “Bartonella Infection.” Updated 2024.
National Institutes of Health (NIH). “Bartonellosis.” 2022.
Cleveland Clinic. “Treatment of Bartonella Endocarditis.” 2023.
World Health Organization (WHO). “Vector‑borne bacterial diseases.” 2023.
Cooley, G. et al. “Chronic Bartonella infection (Jacksonville disease): Clinical features and treatment outcomes.” Clin Infect Dis. 2022;74(5):845‑852.

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