Treatment of Blood Culture-Negative Infective Endocarditis Due to Tropheryma whipplei
A proportion of infective endocarditis cases yield persistently negative blood cultures. Among these, Tropheryma whipplei — the causative agent of Whipple's disease — is a recognised pathogen that demands a distinct, organism-specific treatment approach rather than standard empirical antibiotic coverage.
Clinical Scenario
This protocol is indicated when infective endocarditis is confirmed or strongly suspected and blood cultures remain negative, with Tropheryma whipplei identified as the causative organism. Because the pathogen cannot be recovered by standard blood culture methods, targeted diagnostic confirmation — such as PCR from serum or tissue — is central to establishing the diagnosis before treatment is initiated.
Treatment approach: Management involves a prolonged oral combination antibiotic regimen. When central nervous system involvement is identified, the regimen is modified with an additional agent. Alternative antibiotic strategies are also available for situations where the primary regimen cannot be used — the full algorithm is in the protocol.
References
- Doxycycline (200 mg/24 h) plus hydroxychloroquine (200–600 mg/24 h) orally for ≥18 months
- In cases of CNS involvement, sulfadiazine 1.5 g/6 h orally must be added to doxycycline.
- An alternative therapy is ceftriaxone (2 g/24 h i.v.) for 2–4 weeks or penicillin G (2 million U/4 h) and streptomycin (1 g/24 h) i.v. for 2–4 weeks followed by cotrimoxazole (800 mg/12 h) orally.
DOI: 10.1093/eurheartj/ehad193
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