Abstract
Objectives
Bartonella spp., renowned for cat-scratch disease, has limited reports of dissemination. Tissue and blood cultures have limitations in detecting this fastidious pathogen. Molecular testing (polymerase chain reaction, PCR) and cell-free DNA have provided an avenue for diagnoses. This retrospective observational multicenter study describes the incidence of disseminated Bartonella spp. and treatment-related outcomes.
Methods
Inclusion criteria were diagnosis of bartonellosis via diagnosis code, serology testing of blood, polymerase chain reaction (PCR) of blood, 16/18S tests of blood or tissue, cultures of blood or tissue, or cell-free DNA of blood or tissue from January 1, 2014, through September 1, 2021. Exclusions were patients who did not receive treatment, insufficient data on treatment course, absence of dissemination, or retinitis as dissemination.
Results
Patients were primarily male (n = 25, 61.0%), white (n = 28, 68.3%), with mean age of 50 years (SD 14.4), and mean Charlson comorbidity index of 3.5 (SD 2.1). Diagnosis was primarily by serology (n = 34, 82.9%), with Bartonella henselae (n = 40, 97.6%) as the causative pathogen. Treatment was principally doxycycline with rifampin (n = 17, 41.5%). Treatment failure occurred in 16 (39.0%) patients, due to escalation of therapy during treatment (n = 5, 31.3%) or discontinuation of therapy due to an adverse event or tolerability (n = 5, 31.3%).
Conclusions
In conclusion, this is the largest United States-based cohort of disseminated Bartonella spp. infections to date with a reported 39% treatment failure. This adds to literature supporting obtaining multiple diagnostic tests when Bartonella is suspected and describes treatment options.
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Data availability
The data that support the findings of this study are available from the corresponding author, MP, upon reasonable request.
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Acknowledgements
All authors contributed data and edits to manuscript. MP, PB, CD, and BB conceptualized and developed methodology. MP coordinated sites and compiled data. MP and BB did data analysis. MP and PB wrote manuscript.
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All authors contributed data and edits to manuscript. MP, PB, CD, and PBB conceptualized and developed methodology. MP coordinated sites and compiled data. MP and PBB did data analysis. MP and PB wrote manuscript and revisions.
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Pizzuti, M., Bailey, P., Derrick, C. et al. Epidemiology and treatment of invasive Bartonella spp. infections in the United States. Infection (2024). https://doi.org/10.1007/s15010-024-02177-1
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DOI: https://doi.org/10.1007/s15010-024-02177-1