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Pulmonary Strongyloidiasis: The Varied Clinical Presentations
Babak Mokhlesi1, Oksana Shulzhenko, Prasad S Garimella
1Division of Pulmonary and Critical Care, Cook County Hospital and Rush University Medical Center, Chicago, IL.
Clinical Pulmonary Medicine
|January 30, 2010
Summary
Strongyloides stercoralis can complete its life cycle within a human host, leading to chronic infections. Immunosuppression can trigger dangerous hyperinfection, emphasizing the need for high diagnostic suspicion.
Area of Science:
- Parasitology
- Infectious Diseases
- Immunology
Background:
- Strongyloides stercoralis exhibits a unique life cycle, allowing for autoinfection within the human host.
- Persistent infections can occur for years, often with mild, fluctuating gastrointestinal or pulmonary symptoms.
- Impaired cell-mediated immunity (e.g., due to corticosteroids, malignancy, or acquired immunodeficiency syndrome) can lead to hyperinfection and dissemination.
Purpose of the Study:
- To highlight the unique parasitic life cycle of Strongyloides stercoralis.
- To underscore the risks associated with immunosuppression in strongyloidiasis.
- To emphasize the diagnostic challenges and the importance of a high index of suspicion.
Main Methods:
- Review of parasitic life cycle characteristics.
- Analysis of clinical manifestations and risk factors for hyperinfection.
- Discussion of diagnostic considerations in endemic and non-endemic populations.
Main Results:
- The parasite's ability to complete its life cycle within the host facilitates chronic infections and autoinfection.
- Strongyloidiasis is endemic in tropical/subtropical regions and the southeastern US, associated with asthma, lung disease, and immunosuppression.
- Eosinophilia is not a reliable diagnostic marker, necessitating a high index of suspicion for diagnosis.
Conclusions:
- Strongyloidiasis poses a significant risk, particularly in immunocompromised individuals, due to potential hyperinfection.
- The diagnosis requires clinical suspicion, especially given the variable and often mild initial symptoms.
- Understanding the parasite's biology and host-pathogen interactions is crucial for effective management.
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