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[Tropheryma whippelii, an emerging intracellular pathogen causing Whipple disease]
1Unité des Rickettsies, CNRS UPRES-A 6020, Faculté de Médecine, Université de la Méditerranée, Marseille. Michel.Drancourt@medecine.univ-mrs.fr
Clinical Diagnosis:
Whipple's disease is a diffuse disease with a wide variety of clinical manifestations. Differential diagnoses include chronic enteritis, chronic joint disease, chronic meningoencephalitis and prolonged fever with weight loss, chronic uveitis and endocarditis with negative blood culture. MOLECULAR DIAGNOSIS: Histologically the characteristic lesions contain PAS-positive inclusions. PCR of RNAr gene 16S in fresh tissue identifies Tropheryma whippelii and confirms bacteriological diagnosis. AN EMERGING PATHOGEN: Tropheryma whippelii is a recently identified pathogen highly difficult to culture. Since its discovery, it has been a model of emerging pathogens. Clinical observation, microscope studies, molecular and cellular biology, and bacteriology have all contributed to its recent isolation which should lead to the development of indirect diagnostic techniques [abstract corrected]
Insights
Whipple's disease diagnosis is enhanced by identifying Tropheryma whippelii using PCR of the 16S rRNA gene in tissue. This molecular method aids in diagnosing this rare bacterial infection with diverse clinical signs.
Area of Science:
- Microbiology
- Infectious Diseases
- Molecular Diagnostics
Context:
- Whipple's disease presents with varied clinical symptoms, complicating diagnosis.
- Differential diagnoses are extensive, including chronic enteritis, arthritis, and neurological disorders.
- Traditional diagnostic methods are often insufficient for early and accurate detection.
Purpose:
- To highlight the utility of molecular diagnostic techniques for Whipple's disease.
- To emphasize the identification of Tropheryma whippelii as the causative agent.
- To discuss the challenges and advancements in diagnosing this rare condition.
Summary:
- Whipple's disease is characterized by PAS-positive inclusions in affected tissues.
- Polymerase Chain Reaction (PCR) targeting the 16S rRNA gene in fresh tissue is crucial for identifying Tropheryma whippelii.
- This molecular approach confirms the bacteriological diagnosis, overcoming culture difficulties.
Impact:
- Establishes PCR as a key diagnostic tool for Whipple's disease.
- Advances understanding of Tropheryma whippelii as a model emerging pathogen.
- Facilitates the development of novel indirect diagnostic strategies for improved patient outcomes.