A New Method for Forensic DNA Analysis of the Blood Meal in Chagas Disease Vectors Demonstrated Using Triatoma infestans from Chuquisaca, Bolivia
Open Access
- 30 October 2008
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 3 (10), e3585
- https://doi.org/10.1371/journal.pone.0003585
Abstract
Feeding patterns of the vector are important in the epidemiology of Chagas disease, the leading cause of heart disease in Latin America. Chagas disease is caused by the parasite, Trypanasoma cruzi, which is transmitted by blood feeding insects. Historically, feeding behaviours of haematophagous insects have been investigated using serological reactions, which have detection limits in terms of both taxonomic resolution, and quantity and quality of the blood meal. They are labor intensive, require technical expertise, need fresh or frozen samples and antibodies often are either not available commercially or the resources for synthesis and purification are not available. We describe an assay to identify vertebrate blood meal sources, and the parasite T. cruzi using species-specific PCR assays from insect vectors and use the method to provide information regarding three questions: (1) Do domestic and peri-domestic (chicken coop and animal corral) habitats vary in the blood meals detected in the vectors? (2) What is the pattern of multiple blood meals? (3) Does the rate of T. cruzi infection vary among habitats and is it associated with specific blood meal types? Assays based on the polymerase chain reaction were evaluated for identification of the blood meal source in the heamatophagous Chagas disease vector Triatoma infestans. We evaluate a technique to identify 11 potential vertebrate food sources from the complex mixture extracted from the vector's abdomen. We tested the assay on 81 T. infestans specimens collected from the Andean highlands in the department of Chuquisaca, located in central Bolivia, one of the regions in South America where sylvatic T. infestans have been reported. This area is suggested to be the geographic origin of T. infestans and has very high human infection rates that may be related to sylvatic vector populations. The results of the assays revealed that a high percentage of insects collected in human dwellings had fed on peri-domestic animals. In contrast, one insect from a chicken coop but no bugs from corrals tested positive for human blood. Forty-eight percent of insects tested positive for more than one vertebrate species. T. cruzi infection was detected in 42% of the specimens. From the epidemiological point of view, the results reveal an overall pattern of movement from peri-domestic structures to human habitations for T. infestans in this region of Bolivia as well as the important role of pigs, dogs, chickens and guinea pigs in the dynamics of T. cruzi infection.Keywords
This publication has 44 references indexed in Scilit:
- Microsatellites Reveal a High Population Structure in Triatoma infestans from Chuquisaca, BoliviaPLoS Neglected Tropical Diseases, 2008
- Identification of Blood Meal Source and Infection withTrypanosoma cruziof Chagas Disease Vectors Using a Multiplex Cytochrome b Polymerase Chain Reaction AssayVector-Borne and Zoonotic Diseases, 2007
- Sylvatic Triatoma infestans (Reduviidae, Triatominae) in the Andean valleys of BoliviaActa Tropica, 2007
- Reinfestation Sources for Chagas Disease Vector,Triatoma infestans, ArgentinaEmerging Infectious Diseases, 2006
- Feeding rates, nutritional status and flight dispersal potential of peridomestic populations of Triatomainfestans in rural northwestern ArgentinaActa Tropica, 2005
- Can wild Triatoma infestans foci in Bolivia jeopardize Chagas disease control efforts?Trends in Parasitology, 2005
- Quantitative PCR for DNA identification based on genome-specific interspersed repetitive elementsGenomics, 2004
- Shifting Host Choices of the Vector of Chagas Disease, Triatoma Infestans, in Relation to the Availability of Host in Houses in North-West ArgentinaJournal of Applied Ecology, 1997
- Chagas Disease Vector Control in Tupiza, Southern BoliviaMemórias do Instituto Oswaldo Cruz, 1997
- Genetic analysis of Triatoma infestans following insecticidal control interventions in central BoliviaActa Tropica, 1996