Characterization of Triatoma guasayana biotopes in a hardwood forest of Santiago del Estero, Argentina

Vezzani, Darío; Schweigmann, Nicolás; Pietrokovsky, Silvia; Wisnivesky‐Colli, Cristina

doi:10.1590/s0074-02762001000400004

Cited by 20 publications

(19 citation statements)

References 11 publications

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“…Triatoma guasayana was an active flyer seeking out potential hosts, with most flight activity occurring just after sunset. Both T. guasayana and T. sordida have been implicated as sylvatic vectors of T. cruzi in parts of the dry Chaco region (Wisnivesky-Colli et al 1997; Vezzani et al 2001). In Paraguayan localities, both species were frequently observed near and around households, especially the adults, which have a great capacity for flight (Yeo et al 2005; Rolón et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Hosts and vectors of Trypanosoma cruzi discrete typing units in the Chagas disease endemic region of the Paraguayan Chaco

et al. 2017

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SUMMARYActive Trypanosoma cruzi transmission persists in the Gran Chaco region, which is considered hyperendemic for Chagas disease. Understanding domestic and sylvatic transmission cycles and therefore the relationship between vectors and mammalian hosts is crucial to designing and implementing improved effective control strategies. Here we describe the species of triatomine vectors and the sylvatic mammal reservoirs of T. cruzi, in different localities of the Paraguayan and Bolivian Chaco. We identify the T. cruzi genotypes discrete typing units (DTUs) and provide a map of their geographical distribution. A total of 1044 triatomines and 138 sylvatic mammals were captured. Five per cent of the triatomines were microscopically positive for T. cruzi (55 Triatoma infestans from Paraguay and one sylvatic Triatoma guasayana from Bolivia) and 17 animals (12·3%) comprising eight of 28 (28·5%) Dasypus novemcinctus, four of 27 (14·8%) Euphractus sexcinctus, three of 64 (4·7%) Chaetophractus spp. and two of 14 (14·3%) Didelphis albiventris. The most common DTU infecting domestic triatomine bugs was TcV (64%), followed by TcVI (28%), TcII (6·5%) and TcIII (1·5%). TcIII was overwhelmingly associated with armadillo species. We confirm the primary role of T. infestans in domestic transmission, armadillo species as the principal sylvatic hosts of TcIII, and consider the potential risk of TcIII as an agent of Chagas disease in the Chaco.

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Section: Discussionmentioning

confidence: 99%

Hosts and vectors of Trypanosoma cruzi discrete typing units in the Chagas disease endemic region of the Paraguayan Chaco

et al. 2017

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“…and trunks and this species usually feeds on rodents, marsupials and birds (Carcavallo et al 1988, Vezzani et al 2001. Its epidemiological importance is considered but in 1985 its presence in housing, where T. infestans had been controlled by insecticides (Carcavallo et al, 1985), was mentioned.…”

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confidence: 99%

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

Loza-Murguia¹,

Noireau²

2010

Neotrop. entomol.

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-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.

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“…The population structure of T. patagonica reveals that almost all the adults were collected in summer, whereas those of silvatic triatomines from Northern Argentina such as T. sordida (Bar & Wisnivesky 2001) and T. guasayana (Vezzani et al 2001) were only found before this season. This result may indicate a delay in the reproductive period of T. patagonica possibly related to lower spring temperatures registered in Patagonia.…”

Section: Discussionmentioning

confidence: 99%

“…In Argentina, the main candidates to occupy the vacant niche left by T. infestans would be the silvatic and peridomestic species of the sordida group: T. sordida Stål (Bar et al 2002), T. guasayana Wygodzinsky & Abalos (Gajate et al 1996), and T. patagonica Del Ponte. The former two species have been intensively studied (Forattini et al 1982, Wisnivesky-Colli et al 1997, Rocha Pires et al 1999, Bar & Wisnivesky-Colli 2001, Vezzani et al 2001), but there is comparatively little information available on the ecology of T. patagonica and current knowledge is based on non-methodical studies.…”

mentioning

confidence: 99%

Ecological characteristics of Triatoma patagonica at the Southern limit of its distribution (Chubut, Argentina)

Wisnivesky‐Colli

Vezzani

Pietrokovsky

et al. 2003

Mem. Inst. Oswaldo Cruz

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Characterization of Triatoma guasayana biotopes in a hardwood forest of Santiago del Estero, Argentina

Cited by 20 publications

References 11 publications

Hosts and vectors of Trypanosoma cruzi discrete typing units in the Chagas disease endemic region of the Paraguayan Chaco

Hosts and vectors of Trypanosoma cruzi discrete typing units in the Chagas disease endemic region of the Paraguayan Chaco

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

Ecological characteristics of Triatoma patagonica at the Southern limit of its distribution (Chubut, Argentina)

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