Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Triatoma guasayana (Wygodzinsky & Abalos) is a peridomestic triatomine with epidemiological importance in Bolivia, that may play an important role in the transmission of Trypanosoma cruzi (Chagas). In this study, two parameters of vectorial capacity were evaluated: the interval of feeding-defeca...

Full description

Saved in:
Bibliographic Details
Published in:Neotropical entomology 2010-09, Vol.39 (5), p.799-809
Main Authors: Loza-Murguía, Manuel(Catholic Bolivian University San Pablo Coroico Department of Parasitology & Microbiology), Noireau, François(Institut Français de Recherche Scientifique)
Format: Article
Language:English
Subjects:
Animal biology
Animals
attacking time
Biodiversity and Ecology
Chagas Disease - epidemiology
Chagas Disease - transmission
Chrono M
ENTOMOLOGY
Environmental Sciences
feeding time
feeding-defecation interval
Insect Vectors
Invertebrate Zoology
Life Sciences
Metacyclogenesis
Triatoma - parasitology
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Triatoma guasayana (Wygodzinsky & Abalos) is a peridomestic triatomine with epidemiological importance in Bolivia, that may play an important role in the transmission of Trypanosoma cruzi (Chagas). In this study, two parameters of vectorial capacity were evaluated: the interval of feeding-defecation time and metacyclogenesis, in adult males and females and nymphal instars II to V of T. guasayana with comparisons with Triatoma infestans (Klug) and T. sordida (Stal). The results showed a close relationship between ingestion of blood and beginning of defecation. Values were negative in T. infestans, and T. sordida for instars II, III, IV, and V and also males and females but were positive in female T. sordida. Triatoma guasayana showed only negative values for instar II. Adults and nymphs began defecation as soon as they had finished feeding and required an average of 29.8 min. The analysis of metacyclogenesis showed that T. guasayana was superior to T. infestans and T. sordida. However, the vectorial effectiveness of T. guasayana was significantly affected regarding the percentage of metacyclic trypomastigotes during instars III to V and showed a progressive increase. Females had higher proportions despite their ingestion being half that of T. infestans. The different instars of T. guasayana had a higher parasitic load than those of T. sordida and, although ingestion was 1/3 of that of female T. infestans, there was a progressive increase in metacyclic trypomastigotes in the different nymphal stages of T. guasayana that decreased in adults.
ISSN:1519-566X
1678-8052
1678-8052
DOI:10.1590/S1519-566X2010000500020