Clinical Report: Familial Whipple's Disease with Endocarditis and Chorioretinitis

Overview

This case series describes four related patients diagnosed with Whipple's disease (WD), highlighting diagnostic delays and multisystem involvement including endocarditis, pericarditis, arthritis, and ocular manifestations. Molecular diagnostics, including PCR for Tropheryma whipplei, and histopathology were key to confirming the diagnosis.

Background

Whipple's disease is a rare systemic infection caused by the gram-positive bacterium Tropheryma whipplei, typically affecting middle-aged Caucasian males. It presents with a broad spectrum of symptoms, commonly gastrointestinal complaints and arthralgia, but may involve multiple organ systems including the heart and eyes. Diagnosis is challenging due to nonspecific symptoms and rarity, often resulting in delayed recognition. PCR testing and duodenal biopsy with PAS staining are important diagnostic tools.

Data Highlights

Case 1 presented with severe anemia (hemoglobin 60 g/L), thrombocytopenia (12 × 10⁹/L), elevated CRP (83 mg/L), and ESR (70 mm/h). Echocardiography revealed vegetations on all three aortic cusps. PCR testing of blood and duodenal biopsy confirmed T. whipplei infection. Ophthalmologic exam showed bilateral multifocal chorioretinitis. Treatment included prolonged intravenous ceftriaxone followed by oral doxycycline and hydroxychloroquine over two years, resulting in clinical improvement and normalization of laboratory parameters.

Key Findings

• Whipple's disease can present with multisystem involvement including endocarditis, pericarditis, arthritis, and ocular inflammation such as chorioretinitis.
• PCR testing for Tropheryma whipplei in blood and tissue samples is critical for diagnosis, especially when blood cultures are negative.
• Delayed diagnosis is common due to nonspecific symptoms and rarity of the disease, as illustrated by years of symptoms before diagnosis in this family.
• Close relatives may also be affected, suggesting possible familial susceptibility or shared exposure.
• Long-term antibiotic therapy is necessary for clinical remission and to prevent relapse.

Clinical Implications

Clinicians should consider Whipple's disease in patients with unexplained systemic symptoms including arthralgia, gastrointestinal complaints, and cardiac manifestations such as culture-negative endocarditis. Early use of PCR diagnostics and duodenal biopsy can facilitate timely diagnosis. Awareness of familial cases may prompt screening of relatives presenting with compatible symptoms.

Conclusion

This familial case series underscores the importance of considering Whipple's disease in multisystem inflammatory presentations and utilizing molecular diagnostics for early detection. Prolonged targeted antibiotic therapy can lead to favorable outcomes despite initial diagnostic challenges.

References

1. Original Article 2023 -- A Family's Battle Against Tropheryma whipplei: Insights from a Case Series