Triatominae Survey (Hemiptera: Reduviidae: Triatominae) in the South-Central Region of the State of Bahia, Brazil Between 2008 and 2013

Mendonça, Vagner José; Oliveira, Jader de; Rimoldi, Aline; Filho, Júlio César Rente Ferreira; Araújo, Renato Freitas de; Rosa, João Aristeu da

doi:10.4269/ajtmh.14-0556

Cited by 10 publications

(6 citation statements)

References 24 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The infection rates of T. cruzi observed in our study were similar to those obtained in recent studies carried out in Pernambuco [42], Mato Grosso do Sul [43, 44] Ceará [45, 46], the Rio Grande do Norte [47, 48] and Bahia [19, 20]. Infection rates were high for T. brasiliensis species complex, especially for T. sherlocki (43.1%).…”

Section: Discussionsupporting

confidence: 89%

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

et al. 2019

Self Cite

View full text Add to dashboard Cite

BackgroundThe identification of Trypanosoma cruzi and blood-meal sources in synanthropic triatomines is important to assess the potential risk of Chagas disease transmission. We identified T. cruzi infection and blood-meal sources of triatomines caught in and around houses in the state of Bahia, northeastern Brazil, and mapped the occurrence of infected triatomines that fed on humans and domestic animals.MethodsTriatominae bugs were manually captured by trained agents from the Epidemiologic Surveillance team of Bahia State Health Service between 2013 and 2014. We applied conventional PCR to detect T. cruzi and blood-meal sources (dog, cat, human and bird) in a randomized sample of triatomines. We mapped triatomine distribution and analyzed vector hotspots with kernel density spatial analysis.ResultsIn total, 5906 triatomines comprising 15 species were collected from 127 out of 417 municipalities in Bahia. The molecular analyses of 695 triatomines revealed a ~10% T. cruzi infection rate, which was highest in the T. brasiliensis species complex. Most bugs were found to have fed on birds (74.2%), and other blood-meal sources included dogs (6%), cats (0.6%) and humans (1%). Trypanosoma cruzi-infected triatomines that fed on humans were detected inside houses. Spatial analysis showed a wide distribution of T. cruzi-infected triatomines throughout Bahia; triatomines that fed on dogs, humans, and cats were observed mainly in the northeast region.ConclusionsSynanthropic triatomines have a wide distribution and maintain the potential risk of T. cruzi transmission to humans and domestic animals in Bahia. Ten species were recorded inside houses, mainly Triatoma sordida, T. pseudomaculata, and the T. brasiliensis species complex. Molecular and spatial analysis are useful to reveal T. cruzi infection and blood-meal sources in synanthropic triatomines, identifying areas with ongoing threat for parasite transmission and improving entomological surveillance strategies.

show abstract

Section: Discussionsupporting

confidence: 89%

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Almost all the Chagas disease cases were observed in young rural workers (23-36 years) with low education originating from northeast Brazil (states of Bahia and Alagoas). In the northeast region, natural T. cruzi transmission with participation of Triatominae vectors has been observed [22]. These positive cases of Chagas disease can be regarded as introduced from endemic areas; therefore, we can consider that the T. cruzi seroprevalence in the western part of São Paulo state can result from two events: (i) entrance of immigrants from other Brazilian regions endemic for Chagas disease (or highly endemic Latin American countries such as Bolivia and Argentina), and (ii) residual undiagnosed asymptomatic cases before eradication of T. cruzi in the State.…”

Section: Discussionmentioning

confidence: 99%

Prevalence of Trypanosoma Cruzi antibodies in blood donors from the Sao Paulo State, Brazil, between 2012 and 2014

Slavov

Otaguiri

Pinto

et al. 2017

J Infect Dev Ctries

View full text Add to dashboard Cite

Introduction: American tripanosomiasis (Chagas disease), the second most neglected disease in the world, is caused by the protozoan parasite Trypanosoma cruzi. Though natural transmission by insect vectors has been controlled, there is significant risk of T. cruzi transmission by blood transfusion in non-endemic regions, generally due to immigration processes from endemic areas. Methodology: The objective of this study was to evaluate anti-T. cruzi seroprevalence in blood donors from the western part of São Paulo State, Brazil, by serologic and immunofluorescence confirmation tests for the period between 2012 and 2014. Currently, this region is regarded as a non-endemic area for Chagas disease. Results: The confirmed overall T. cruzi seroprevalence among blood donors was 0.10%, which can be considered low compared to other Brazilian regions. Nevertheless, the distribution of the anti-T. cruzi antibodies within the examined region was uneven, and some areas of significantly higher prevalence were observed. Conclusions: We could consider two tendencies in the prevalence of T. cruzi: (i) residual older undiagnosed cases from São Paulo State, and (ii) immigration from endemic Brazilian or South American regions. The discordance obtained for T. cruzi prevalence by serologic and immunofluorescence methods demonstrates that more specific routine diagnosis is needed to diminish the cost of the assays and the loss of blood supply once all seropositive blood bags are immediately discarded.

show abstract

“…In health system demonstrate that these entomological indicators are relevant [17][18][19][20][21][22].…”

Section: Discussionmentioning

confidence: 97%

Triatoindex: A Composite Indicator for Triatomine Surveillance

Ribeiro

Sousa

Santos

et al. 2020

Preprint

View full text Add to dashboard Cite

Background: Entomological indicators are essential to guide surveillance and control of vector-borne diseases. Indicators of Chagas disease vector surveillance such as infestation, colonization, and density depend on wide surveys performed by trained health agents that are difficult to maintain in endemic countries; now, surveillance is mainly based on community participation. Thus, the development of an index that aggregates variables of vectorial potential and occurrence and triatomine species may be useful. Objective: To develop an index for triatomine bug surveillance. Methods: The index was developed based on entomological surveillance data from the State of Bahia, Brazil, between 2006 and 2019. For each triatomine species, the following data were analyzed: a) relative abundance; b) geographic distribution, c) proportion of nymphs; d) Trypanosoma cruzi infection; e) human contact/ blood meal sources. Values were assigned to each of these variables and the sum of the values generated the index (TriatoIndex = Ti) that ranged from 0 to 15. Subsequently, the municipalities' Ti value was calculated, based on the sum of the Ti values of the species registered in each municipality. RESULTS: From the 26 species of triatomines in Bahia, 20 (77%) presented Ti <10. Triatoma infestans (15), T. sordida (14), T. brasiliensis (13), T. pseudomaculata (12), T. melanica (10), and T. juazeirensis (10) presented the highest values of Ti in the studied area. The Ti values in the municipalities in the central and northeastern regions of Bahia were high; these areas were considered hotspots for the occurrence of the main important vectors. Conclusions: The index presented takes into account the geographical distribution and vectorial potential of triatomines within the region. TriatoIndex is a promising tool for targeted surveillance of T. cruzi vectors.

show abstract

Triatominae Survey (Hemiptera: Reduviidae: Triatominae) in the South-Central Region of the State of Bahia, Brazil Between 2008 and 2013

Cited by 10 publications

References 24 publications

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

Wide distribution of Trypanosoma cruzi-infected triatomines in the State of Bahia, Brazil

Prevalence of Trypanosoma Cruzi antibodies in blood donors from the Sao Paulo State, Brazil, between 2012 and 2014

Triatoindex: A Composite Indicator for Triatomine Surveillance

Contact Info

Product

Resources

About