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Putting Infection Dynamics at the Heart of Chagas Disease
Michael D Lewis1, John M Kelly2
1Department of Pathogen Molecular Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK; Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA.
Insights
Chronic Trypanosoma cruzi infections involve immune responses that control but do not eliminate the parasite. Understanding parasite persistence is key to Chagas disease pathogenesis and treatment optimization.
Area of Science:
- Immunology
- Infectious Diseases
- Parasitology
Background:
- Chronic Trypanosoma cruzi infections are characterized by immune responses that control but do not eliminate the parasite.
- Detecting infected cells is challenging due to their scarcity and focal distribution across multiple sites.
- Advances in detection technologies link parasite persistence to Chagas heart disease pathogenesis.
Purpose of the Study:
- To highlight the importance of quantitative, spatial, and temporal aspects of T. cruzi infection.
- To deepen the understanding of the relationship between parasite persistence, disease pathogenesis, and immune responses.
- To inform strategies for optimizing treatment of Chagas disease.
Main Methods:
- Review and synthesis of current research on T. cruzi infection dynamics.
- Analysis of findings from murine models to infer human infection patterns.
- Emphasis on quantitative, spatial, and temporal infection characteristics.
Main Results:
- Parasite persistence, involving continuous and episodic reinvasion, varies by tissue.
- The gastrointestinal tract is identified as a primary reservoir site in murine models.
- Effective, yet non-sterilizing, immune responses control parasite burden.
Conclusions:
- Quantitative, spatial, and temporal infection dynamics are crucial for understanding Chagas disease.
- Elucidating primary human reservoir sites is essential for effective intervention.
- Optimizing treatment requires a comprehensive understanding of parasite persistence and host immunity.
Abstract:
In chronic Trypanosoma cruzi infections, parasite burden is controlled by effective, but nonsterilising immune responses. Infected cells are difficult to detect because they are scarce and focally distributed in multiple sites. However, advances in detection technologies have established a link between parasite persistence and the pathogenesis of Chagas heart disease. Long-term persistence likely involves episodic reinvasion as well as continuous infection, to an extent that varies between tissues. The primary reservoir sites in humans are not definitively known, but analysis of murine models has identified the gastrointestinal tract. Here, we highlight that quantitative, spatial, and temporal aspects of T. cruzi infection are central to a fuller understanding of the association between persistence, pathogenesis, and immunity, and for optimising treatment.
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