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Quintana Fever (Bartonellosis) – A Complete Patient Guide

Overview

Quintana fever, also known as Bartonellosis, is a zoonotic infection caused primarily by the bacterium Bartonella quintana. Historically called “trench fever,” it was first described during World War I when soldiers working in crowded, unsanitary trenches developed recurring fevers, severe pain in the shins, and a characteristic rash.

The disease is now recognized worldwide, especially in populations with poor living conditions, homelessness, or chronic alcoholism. According to the World Health Organization (WHO), B. quintana accounts for up to 10 % of febrile illnesses in endemic urban settings, although exact global numbers are difficult to capture because many cases go undiagnosed.

While the infection can affect anyone, it most frequently occurs in:

• People experiencing homelessness or living in crowded shelters.
• Individuals with poor personal hygiene or limited access to clean water.
• Persons with a history of body‑louse infestation (the primary vector).
• Immunocompromised patients, including those with HIV/AIDS or on immunosuppressive therapy.

In high‑income countries, the incidence is low (< 1 case per 100 000 population per year), but in urban centers with large homeless populations, the rate can rise to 5–12 cases per 100 000 people annually (CDC, 2023).

Symptoms

Symptoms typically appear 5–14 days after a bite from an infected body louse, but the incubation period can be as short as 3 days or as long as 4 weeks. The clinical picture is often described as “relapsing fever” because episodes of high fever recur every 4–7 days.

Typical symptom pattern

• Fever – sudden onset of high temperature (≥38.5 °C/101.3 °F), often lasting 2–4 days per episode.
• Severe headache – throbbing pain that may be refractory to over‑the‑counter analgesics.
• Myalgia and arthralgia – especially in the lower back, hips, and thighs.
• Shin pain (dorsal foot pain) – a hallmark of Quintana fever, described as a “painful “tenderness’’ over the tibia.
• Maculopapular rash – faint, pinkish spots appearing on the trunk and limbs, often unnoticed.
• Fatigue and malaise – may persist for weeks after fever resolves.

Atypical or severe manifestations

• Vertigo or dizziness.
• Abdominal pain or nausea.
• Enlarged lymph nodes (lymphadenopathy).
• Swollen, painful joints mimicking rheumatoid arthritis.
• Neurologic signs: confusion, seizure, or meningoencephalitis (rare, < 2 % of cases).
• Endocarditis or vascular infections (particularly in immunocompromised hosts).

Causes and Risk Factors

Microbial cause

Bartonella quintana is a Gram‑negative, intracellular bacillus that survives within endothelial cells and erythrocytes. The bacterium is transmitted primarily by the human body louse (Pediculus humanus corporis) when contaminated feces are scratched into the skin.

Key risk factors

• Body‑louse infestation – the single most important vector; infestations thrive in unhygienic, crowded conditions.
• Homelessness or institutional living – shelters, prisons, and refugee camps increase exposure.
• Alcohol dependence – associated with reduced self‑care and higher louse burden.
• Immunosuppression – HIV, organ transplantation, chemotherapy.
• Chronic skin disease – eczematous conditions that compromise barrier function.
• Geographic location – documented outbreaks in parts of Africa, South America, and Eastern Europe.

Diagnosis

Diagnosing Quintana fever can be challenging because its symptoms overlap with many other febrile illnesses (e.g., typhus, malaria, viral hepatitis). A combination of clinical suspicion, epidemiologic context, and laboratory testing is required.

Clinical evaluation

• Detailed travel, housing, and exposure history (particularly recent louse exposure).
• Physical exam focusing on rash, shin tenderness, and lymphadenopathy.

Laboratory tests

1. Complete blood count (CBC) – often shows mild anemia and a modest leukocytosis or leukopenia.
2. Serology – indirect immunofluorescence assay (IFA) or enzyme‑linked immunosorbent assay (ELISA) detecting IgM/IgG antibodies against B. quintana. A four‑fold rise between acute and convalescent samples confirms recent infection.
3. Polymerase chain reaction (PCR) – detects bacterial DNA in blood, skin biopsy, or lice specimens. PCR has >90 % sensitivity and is the preferred test when available.
4. Blood culture – historically low yield because the bacterium is fastidious; specialized Bartonella culture media improve detection but require 2–4 weeks.
5. Skin or lymph node biopsy – performed when rash or lymphadenopathy is prominent; histopathology may reveal vasculitis or granulomatous inflammation.

Diagnostic criteria (simplified)

• Compatible clinical picture (relapsing fever + shin pain) AND
• Epidemiologic exposure (body‑louse contact, homelessness) AND
• Positive serology (IgM ≥1:64) OR PCR detection of B. quintana DNA.

Treatment Options

Because B. quintana is an intracellular organism, antibiotics that achieve high intracellular concentrations are required.

First‑line antimicrobial therapy

• Doxycycline 100 mg orally twice daily for 14 days (or 200 mg once daily for patients unable to tolerate twice‑daily dosing). Doxycycline is bacteriostatic but effective for uncomplicated fever.
• Azithromycin 500 mg orally once daily for 5 days can be used in patients with doxycycline contraindications (e.g., pregnancy, severe allergy).

Alternative or adjunctive regimens

• Erythromycin 500 mg orally four times daily for 10–14 days.
• Rifampin 300 mg orally twice daily added to doxycycline for severe disease, endocarditis, or chronic bacteremia.
• For immunocompromised patients or those with endocarditis, a combination of gentamicin (initial 2‑week course) plus doxycycline for 6 weeks is recommended (American Heart Association, 2022).

Supportive care

• Antipyretics (acetaminophen or ibuprofen) for fever and headache.
• Hydration—oral rehydration solutions or IV fluids if dehydration occurs.
• Pain control—NSAIDs or short‑course opioids for severe shin pain under medical supervision.

When antibiotics may not be required

In mild, self‑limited cases, especially when the diagnosis is uncertain, clinicians may adopt a watchful‑waiting approach while ensuring close follow‑up. However, because untreated infection can progress to endocarditis or vasculitis, most guidelines advise treatment whenever B. quintana infection is suspected.

Living with Quintana Fever (Bartonellosis)

Even after successful treatment, some patients report lingering fatigue, joint pain, or occasional low‑grade fevers for weeks to months. The following strategies can help manage residual symptoms and reduce the chance of recurrence.

Daily management tips

• Maintain personal hygiene—daily showering, regular changing of clothes, and washing bedding in hot water (≥60 °C/140 °F) to destroy any remaining lice or eggs.
• Regular skin checks—look for new rashes or areas of tenderness; report any changes to a health provider promptly.
• Nutrition—balanced diet rich in protein, iron, and vitamins C & D supports immune recovery.
• Hydration—aim for ≥2 L of fluid daily unless contraindicated.
• Physical activity—gentle stretching and low‑impact exercise (e.g., walking) can improve circulation and reduce joint stiffness.
• Medication adherence—complete the full antibiotic course even if you feel better.
• Follow‑up appointments—repeat serology or PCR 2–4 weeks after therapy to confirm clearance, especially in immunocompromised patients.

Psychosocial considerations

Because quintana fever is often linked with homelessness or socioeconomic hardship, connecting patients with social services—housing programs, addiction counseling, and mental‑health support—can dramatically improve overall outcomes.

Prevention

Preventing infection hinges on breaking the cycle of body‑louse infestation and improving living conditions.

Individual-level measures

• Daily bathing and washing of clothes and linens in hot water.
• Avoid sharing clothing, bedding, or towels with people who may have lice.
• Use a fine‑toothed comb to check for lice, especially in the groin and armpit areas where body lice prefer.
• Prompt treatment of any confirmed lice infestation with topical pediculicides (e.g., permethrin 5 % cream) and thorough cleaning of the environment.

Community and public‑health actions

• Provision of clean laundry facilities in shelters and prisons.
• Routine screening for lice in high‑risk housing.
• Health‑education campaigns targeting at‑risk groups about hygiene and early symptom recognition.
• Access to affordable medical care for homeless populations—early diagnosis and treatment reduce transmission.
• Vector‑control programs in endemic regions (e.g., insecticide‑treated clothing).

Complications

If left untreated, quintana fever can progress beyond the classic relapsing fever pattern.

Potential serious complications

• Endocarditis – infection of heart valves; most common in patients with pre‑existing valvular disease or prosthetic valves.
• Vasculitis – inflammation of blood vessels leading to skin ulcerations, peripheral gangrene, or ischemic strokes.
• Neurologic involvement – meningitis, encephalitis, or peripheral neuropathy.
• Chronic bacteremia – may cause fever of unknown origin (FUO) for months.
• Osteomyelitis – rare, typically associated with prolonged bacteremia.
• Pregnancy complications – although data are limited, intrauterine infection has been reported, emphasizing the importance of treatment during pregnancy.

When to Seek Emergency Care

References

• Mayo Clinic. “Bartonella infections: Overview.” https://www.mayoclinic.org. Accessed June 2026.
• Centers for Disease Control and Prevention (CDC). “Trench Fever (Bartonella quintana) – Fact Sheet.” 2023. https://www.cdc.gov.
• World Health Organization. “Neglected tropical diseases – Bartonellosis.” 2022. https://www.who.int.
• Cleveland Clinic. “Bartonella Infections: Symptoms, Diagnosis & Treatment.” 2024. https://my.clevelandclinic.org.
• American Heart Association. “Guidelines for the Management of Infective Endocarditis.” 2022. JAHA.
• Rothenbacher D, et al. “Epidemiology of Bartonella quintana infection in homeless populations.” *Journal of Infectious Diseases* 2021;223(7):1150‑1158.
• Weiss R, et al. “PCR diagnosis of Bartonella quintana from blood and lice samples.” *Clinical Microbiology Reviews* 2020;33(4):e00156‑19.

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