Bartonella quintana Ab

What is Bartonella quintana Ab?

Measures antibodies against Bartonella quintana, a bacterium historically linked to trench fever and spread mainly by body lice.

This test detects antibodies against Bartonella quintana, a bacterium transmitted primarily through body lice and associated with conditions such as trench fever and, in some cases, chronic bloodstream or heart valve infection. It relates to the immune system and, in certain presentations, cardiovascular health, since Bartonella species have been linked to endocarditis in rare cases. Clinicians commonly order it when there is a relevant exposure history, such as homelessness, crowded living conditions, or louse exposure, combined with unexplained fever or cardiac findings. As with other Bartonella antibody tests, results are considered alongside exposure history, symptoms, and sometimes additional testing due to potential cross-reactivity between species.

Lifestyle factors that influence this marker

• Practice good personal hygiene and avoid sharing clothing or bedding in settings with known lice exposure
• Seek treatment for body lice promptly if identified, through standard hygiene and pediculicide measures
• Support general immune health with balanced nutrition, sleep, and regular movement
• Avoid smoking and moderate alcohol intake to support overall cardiovascular and immune health

Tests often checked alongside this

• Bartonella henselae Ab — a related species considered together given overlapping testing
• Complete Blood Count (CBC) — general marker of immune and inflammatory activity
• Blood cultures — considered when bloodstream infection is a concern

How this can show up in how you look and feel

• May be associated with recurring fever
• May be associated with fatigue or bone/joint discomfort
• May be associated with symptoms of heart valve involvement in rare, longstanding cases

What can affect this marker

• Timing of exposure relative to testing
• Immune status
• Possible cross-reactivity with other Bartonella species
• Lab-to-lab variability in assay methods

What to track over time

• Whether antibody levels change on repeat testing
• How results relate to fever pattern or cardiac symptoms over time
• Whether additional testing, such as blood cultures or imaging, is being considered

What to ask your doctor

• Does my exposure history support this result?
• Should additional testing be done given this antibody result?
• Could my symptoms be explained by another condition?
• How should this be followed up over time?

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