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Molecular ecology of Triatoma dimidiata in southern Belize reveals risk for human infection and the local differentiation of Trypanosoma cruzi parasites
- Source :
- International Journal of Infectious Diseases, Vol 108, Iss, Pp 320-329 (2021)
- Publication Year :
- 2021
-
Abstract
- Objective In Belize, the main vector for Trypanosoma cruzi, the agent of Chagas disease, is Triatoma dimidiata, but transmission cycles and the risk for human infection are unclear. Therefore, the aim of this study was to identify T. dimidiata blood feeding sources and its parasite and microbial diversity, in order to reconstruct T. cruzi parasite transmission ecology in southern Belize. Methods A metabarcoding approach based on deep sequencing of markers was used for bug taxonomy, blood meal sources, T. cruzi genotypes, and microbiota composition. Bugs were collected in 13 villages of Toledo district. Results Bugs fed on at least 13 species, from domestic hosts such as humans, dogs, cows, and pigs, to synanthropic species such as mice, rats, and opossums, and sylvatic species such as deer, peccary, and kinkajou, in agreement with an opportunistic feeding behavior. Nonetheless, most feeding focused on a few species, including humans. Infection with T. cruzi was detected in 24 of 39 bugs (62%), and the analysis of 242 T. cruzi mini-exon sequences (average 10 ± 5 haplotypes per bug) indicated the presence of TcI and TcIV parasite discrete typing units (DTUs). However, for both DTUs, sequences from Belize mostly clustered apart from sequences from North and South America, suggesting the local differentiation of parasites. T. dimidiata also harbored a diverse bacterial microbiota, with ontogenic changes suggesting microbiota maturation during nymphal development. Conclusions Together, these results indicate a significant risk for T. cruzi infection in humans. They also highlight the need to better characterize the diversity of T. cruzi strains in the region and its impact on disease epidemiology.
- Subjects :
- 0301 basic medicine
Microbiology (medical)
Chagas disease
Swine
Trypanosoma cruzi
030106 microbiology
Blood meal
Zoology
Infectious and parasitic diseases
RC109-216
Molecular ecology
Parasite diversity
03 medical and health sciences
Mice
0302 clinical medicine
Dogs
biology.animal
parasitic diseases
medicine
Parasite hosting
Animals
Humans
Chagas Disease
Parasites
Hematophagous
Transmission network
030212 general & internal medicine
Triatoma dimidiata
Triatoma
biology
Transmission (medicine)
Deer
General Medicine
Kinkajou
biology.organism_classification
medicine.disease
Belize
Insect Vectors
Rats
Infectious Diseases
Vector (epidemiology)
Cattle
Female
Microbiome
Subjects
Details
- ISSN :
- 18783511
- Volume :
- 108
- Database :
- OpenAIRE
- Journal :
- International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases
- Accession number :
- edsair.doi.dedup.....a14f4c29a208e2ce362f3fdc944cdccd