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Urbanization, land tenure security and vector-borne Chagas disease
Michael Z Levy1, Corentin M Barbu2, Ricardo Castillo-Neyra3
1Department of Biostatistics and Epidemiology, The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA Universidad Peruana Cayetano Heredia/University of Pennsylvania Chagas Disease Field Laboratory, Arequipa, Peru mzlevy@mail.med.upenn.edu.
Proceedings. Biological Sciences
|July 4, 2014
Summary
Urbanization in Arequipa, Peru, influences Chagas disease transmission. The vector Triatoma infestans follows city development, with new areas initially free of infestation, concentrating parasite transmission in established communities.
Area of Science:
- Urban ecology and infectious disease transmission.
- Public health and urban planning.
- Entomology and parasitology.
Background:
- Modern cities are rapidly expanding ecosystems.
- Urbanization stages create varied habitats influencing disease vector populations.
- Chagas disease, caused by Trypanosoma cruzi and transmitted by Triatoma infestans, is a persistent issue in Arequipa, Peru.
Purpose of the Study:
- To investigate the relationship between urban development stages and the distribution of Triatoma infestans and Trypanosoma cruzi transmission.
- To understand how urbanization dynamics in Arequipa impact Chagas disease epidemiology.
Main Methods:
- Longitudinal entomological and epidemiological surveys were conducted in households along a transect in Arequipa, Peru.
- The study area represented a gradient of urban development, from established neighborhoods to recent land invasions.
- Data collection focused on vector infestation and parasite presence in relation to urbanization patterns.
Main Results:
- The vector Triatoma infestans was found to be colonizing areas corresponding to urban development.
- Trypanosoma cruzi transmission was primarily concentrated in more established communities, not in new urbanizations.
- New urban areas remained free of vector infestation for extended periods.
Conclusions:
- Urbanization patterns directly influence the spatial and temporal dynamics of Chagas disease vector populations and transmission.
- Increasing land tenure security in new urban areas, without proper zoning, can create conditions favorable for vector-borne disease epidemics.
- Effective urban planning and zoning are crucial for mitigating the risk of vector-borne diseases in rapidly urbanizing environments.
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