Habitat-Specific Occupancy and a Metapopulation Model of Triatoma sordida (Hemiptera: Reduviidae), a Secondary Vector of Chagas Disease, in Northeastern Argentina

INTRODUCTION: from an epidemiological point of view, more than 120 species of triatomine (Hemiptera, Reduviidae) are known. The occurrence and positivity for Trypanosoma cruzi in triatomines in 16 municipalities of the Triângulo Mineiro and Alto Paranaíba were evaluated from January 2002 to December 2004. METHODS: the triatomines were captured basically according to the classic norms of the National Health Foundation. The parasitological exams of the triatomines were conducted according to the technique described by the Ministry of Health. During the study period, 990 specimens of triatomines were captured and of these, 771 could be examined. RESULTS: five species were identified: Triatoma sordida, Panstrongylus diasi, Panstrongylus megistus, Panstrongylus geniculatus and Rhodnius neglectus. Triatoma sordida represented 71.5% of all the triatomines captured, followed by Panstrongylus megistus (18%), Rhodnius neglectus (9.3%), Panstrongylus diasi (0.8%) and Panstrongylus geniculatus (0.4%). Of the total number of triatomines examined, 2.7% were positive for Trypanosoma cruzi. Panstrongylus megistus was the species that presented the highest rates of infection by Trypanosoma cruzi (8.3%), followed by Rhodnius neglectus (2.9%) and Triatoma sordida (1.4%). CONCLUSIONS: there is a need to adapt to new circumstances in epidemiology, with greater emphasis on entomological surveillance, since the potential for adaptation of secondary species of triatomines exists, especially where Chagas' disease is already under control.

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Revisiting the genetic variability of Brazilian peridomestic populations of the Chagas disease vector Triatoma sordida ( ) (Hemiptera, Triatominae)

Infection Genetics and Evolution ◽

10.1016/j.meegid.2020.104568 ◽

2020 ◽

Vol 85 ◽

pp. 104568 ◽

Cited By ~ 1

Author(s):

Fernanda Fernandez Madeira ◽

Luiza Maria Grzyb Delgado ◽

Isadora de Freitas Bittinelli ◽

Ricardo Quitério Sartori ◽

Jader de Oliveira ◽

...

Keyword(s):

Genetic Variability ◽

Chagas Disease ◽

Disease Vector ◽

Triatoma Sordida

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Impacts of residual insecticide spraying on the abundance and habitat occupancy of Triatoma sordida and co-occurrence with Triatoma infestans: A three-year follow-up in northeastern Argentina

Acta Tropica ◽

10.1016/j.actatropica.2019.105251 ◽

2020 ◽

Vol 202 ◽

pp. 105251 ◽

Cited By ~ 1

Author(s):

Lucía I. Rodríguez-Planes ◽

M. Sol Gaspe ◽

Gustavo F. Enriquez ◽

Ricardo E. Gürtler

Keyword(s):

Triatoma Infestans ◽

Habitat Occupancy ◽

Triatoma Sordida ◽

Northeastern Argentina

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The Value of Molecular Studies for the Diagnosis of Congenital Chagas Disease in Northeastern Argentina

American Journal of Tropical Medicine and Hygiene ◽

10.4269/ajtmh.2008.78.624 ◽

2008 ◽

Vol 78 (4) ◽

pp. 624-627 ◽

Cited By ~ 32

Author(s):

Cristina N. Diez ◽

Silvia Manattini ◽

Iván Marcipar ◽

Juan Carlos Zanuttini ◽

Oscar Bottasso

Keyword(s):

Chagas Disease ◽

Molecular Studies ◽

Northeastern Argentina

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Entoepidemiology of Chagas disease in northwest São Paulo and cytogenetic analysis of its main vector, Triatoma sordida (Hemiptera: Triatominae)

Genetics and Molecular Research ◽

10.4238/2013.november.22.8 ◽

2013 ◽

Vol 12 (4) ◽

pp. 5810-5819 ◽

Cited By ~ 2

Author(s):

R. Silistino-Souza ◽

K.C.C. Alevi ◽

N.F.C. Castro ◽

M.N. Freitas ◽

M.D. Papa ◽

...

Keyword(s):

Chagas Disease ◽

Cytogenetic Analysis ◽

Sao Paulo ◽

São Paulo ◽

Triatoma Sordida

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Chagas Disease Vectors of Paraguay: Entomoepidemiological Aspects of Triatoma sordida (Stål, 1859) and Development of an Identification Key for Paraguayan Triatomines Based on Cytogenetics Data

American Journal of Tropical Medicine and Hygiene ◽

10.4269/ajtmh.20-1454 ◽

2021 ◽

Author(s):

Nilsa Elizabeth Gonzalez Britez ◽

Kaio Cesar Chaboli Alevi ◽

Ariane Cristina Caris Garcia ◽

Clara Elena Martínez Purroy ◽

Cleber Galvão ◽

...

Keyword(s):

Vector Control ◽

Chagas Disease ◽

Natural Infection ◽

Identification Key ◽

Triatoma Infestans ◽

Eastern Region ◽

Control Programs ◽

Cytogenetic Data ◽

Triatoma Sordida ◽

Chagas Disease Vectors

Approximately 150,000 people are living with Chagas disease in Paraguay. Although the country has been since 2008 considered as one of the countries that succeeded in interrupted the vector transmission of Chagas by Triatoma infestans in houses of the eastern region, there are nine other species notified in the country that are potential vectors and also deserve attention from vector control programs. Thus, we carried out an entomoepidemiological study of T. sordida in the eastern and western regions of the country and we developed an identification key for Paraguay's triatomines based on cytogenetic data. Between the years 2003 to 2004, 271 specimens of T. sordida were captured in domestic, peridomestic, and wild ecotopes, with 131 insects caught in the eastern (Alto Paraguay, Boquerón and Pte. Hayes) and 140 in the western region of Paraguay (Guairá and Paraguarí). High rates of peridomicillary infestation were observed for both regions. Besides that, the natural infection of the captured insects was detected by optical microscopy in 12% and 10%, and by PCR in 21% and 20% in the eastern and western regions, respectively. Based on cytogenetic data from nine of ten species notified in Paraguay, an identification key was developed to differentiate all taxa. Thus, given the vectorial importance of T. sordida, we highlight the need for continued attention from Paraguay's vector control programs for this species. Further, we provide a taxonomic key that assists in the correct classification of Paraguayan triatomines.

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Evaluation of the impact of chemical control measures and entomological surveillance on Chagas' disease in the counties of Mambaí and Buritinópolis, Goiás State, Brazil

Revista da Sociedade Brasileira de Medicina Tropical ◽

10.1590/s0037-86822001000600009 ◽

2001 ◽

Vol 34 (6) ◽

pp. 549-557 ◽

Cited By ~ 5

Author(s):

Antonio Carlos Silveira ◽

Rosaura Peñaranda-Carrillo ◽

Elias Seixas Lorosa ◽

João Leite ◽

Márcio Costa Vinhaes ◽

...

Keyword(s):

Chagas Disease ◽

Disease Transmission ◽

Stomach Contents ◽

Control Measures ◽

Triatoma Infestans ◽

Food Sources ◽

Epidemiological Surveillance ◽

Entomological Surveillance ◽

Triatoma Sordida ◽

The Impact

Epidemiological surveillance activities were implemented in 1980 in Mambaí and Buritinópolis counties, Goiás State. Twenty years later the authors evaluated the impact of these vector control measures on Chagas' disease transmission, based on entomological indicators. Entomological investigation was conducted using the man-hour technique and covering all domiciles. In order to study vector food sources the stomach contents of triatomines were analyzed using the modified precipitins technique. Triatomines were shown to be present in 48 (71.6%) of the 67 locations. Peridomiciliary infestation rates in Mambaí and Buritinópolis were 8.7% and 12.1%, respectively, while intradomiciliary rates were 0.7% and 1.2%. Triatoma sordida was the species identified in 97.3% of all captured specimens. It was also the only species found to be naturally infected with Trypanosoma cruzi. Birds were the most frequent food source (45%) for Triatoma sordida. The most significant result was the complete absence of Triatoma infestans in the two counties.

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Correlation between infection rate of triatominies and Chagas Disease in Southwest of Bahia, Brazil: a warning sign?

Anais da Academia Brasileira de Ciências ◽

10.1590/0001-3765201620150744 ◽

2016 ◽

Vol 88 (3 suppl) ◽

pp. 1941-1951 ◽

Cited By ~ 2

Author(s):

ELIEZER A. DA SILVEIRA ◽

ISRAEL S. RIBEIRO ◽

MIGUEL S. AMORIM ◽

DALVA V. ROCHA ◽

HELDER S. COUTINHO ◽

...

Keyword(s):

Chagas Disease ◽

Natural Infection ◽

Wide Distribution ◽

Warning Sign ◽

Main Method ◽

Control Programs ◽

Triatoma Sordida ◽

Number Of Patients ◽

The City ◽

Acute Chagas Disease

ABSTRACT Chagas disease, caused by the Trypanosoma cruzi, has a wide distribution in South America, and its main method of control is the elimination of triatomines. It is presented here the geographic distribution and the rate of natural infection by T. cruzi of triatomines collected and evaluated from 2008 to 2013 in southwest of Bahia. Triatomines were captured in the intradomiciliary and peridomiciliary areas of five cities located in the southwest of Bahia state, identified, and analyzed for the presence of trypanosomatids in their feces. During the study period the number of patients suspected for acute Chagas disease was recovered from the Notifiable Diseases Information System (SINAN). 8966 triatomines were captured and identified as belonging to eight species. Twenty-six presented themselves infected, being Triatoma sordida the most abundant and with the highest percentage of infection by T. cruzi. Tremedal was the city with the highest number of cases of acute Chagas' disease reported to SINAN. All cities showed triatomines infected with T. cruzi, so there is considerable risk of vectorial transmission of Chagas disease in the southwestern Bahia state, evidencing the need for vector transmission control programs and preventive surveillance measures.

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Acute Chagas disease outbreak associated with oral transmission

Revista da Sociedade Brasileira de Medicina Tropical ◽

10.1590/s0037-86822008000300014 ◽

2008 ◽

Vol 41 (3) ◽

pp. 296-300 ◽

Cited By ~ 65

Author(s):

Juarez Pereira Dias ◽

Claudilson Bastos ◽

Eline Araújo ◽

Ana Verônica Mascarenhas ◽

Eduardo Martins Netto ◽

...

Keyword(s):

Trypanosoma Cruzi ◽

Chagas Disease ◽

Disease Outbreak ◽

Serological Tests ◽

Oral Transmission ◽

Triatoma Sordida ◽

Acute Chagas Disease

Seven individuals living in a town in the Southwest of Bahia developed sudden signs of cardiac and systemic impairment, with lethality of 28.6%. Serological tests were positive at least in one test in the five patients examined. Forty percent of the Triatoma sordida mynphs found inside or around Trypanosoma cruzi were found by blood culturig in there out five cases the homes of these cases were positive for Trypanosoma cruzi. Transmission probably occurred through consumption of water contaminated with triatomine feces. These findings emphasize the necessity to evaluation the importance of vectors like Triatoma sordida in maintaining the endemicity of this disease.

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