Exploiting triatomine behaviour: alternative perspectives for their control

Lazzari, Cláudio R.; Lorenzo, Marcelo G.

doi:10.1590/s0074-02762009000900011

Cited by 32 publications

(26 citation statements)

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“…Moreover, Saldaña et al [25] reported dogs in a rural location in Panama, were 11.6 times more likely to become infected if Attalea butyracea palms were present in the peridomicile. The effectiveness of vector control strategies could increase by considering the flying ability of triatomine bugs [15] and recognizing the role that palm-house proximity plays in house infestation and re-infestation after control strategies [23, 26]. For instance, one could control vectors using efficient physical barriers, such as window screens, on targeted dwellings near palms [26–28].…”

Section: Discussionmentioning

confidence: 99%

Modeling the effects of palm-house proximity on the theoretical risk of Chagas disease transmission in a rural locality of the Orinoco basin, Colombia

Erazo

Cordovez

2016

Parasites Vectors

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BackgroundChagas disease is a major public health concern in Latin America and it is transmitted by insects of the subfamily Triatominae, including Rhodnius spp. Since palm trees are ubiquitous in Colombia and a habitat for Rhodnius spp., the presence of palms near villages could increase contact rates between vectors and humans. Therefore, knowing whether a relationship exists between the proximity of palms to villages and the abundance and distribution of vectors therein, may be critical for Chagas disease prevention programs. Adapting a mathematical model for R. prolixus population dynamics in a small village, we model the implications of changing distances between palms and dwellings, to the risk of Chagas disease infection.MethodsWe implemented a mathematical model that reflects R. prolixus population dynamics in a small village located in the department of Casanare (Colombia) to study the role of palm-house proximity. We varied the distance between palms and houses by monitoring the network global efficiency metric. We constructed 1,000 hypothetical villages varying distances and each one was run 100 times.ResultsAccording to the model, as palm-house proximity increases, houses were more likely to be visited by triatomine bugs. The number of bugs per unit time increased progressively in a non-linear fashion with high variability. We stress the importance of village configuration on the model output.ConclusionsFrom a theoretical perspective, palm-house proximity may have a positive effect on the incidence of Chagas disease. The model predicts a 1% increase in new human cases per year when houses and palms are brought closer by 75%.Electronic supplementary materialThe online version of this article (doi:10.1186/s13071-016-1884-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Modeling the effects of palm-house proximity on the theoretical risk of Chagas disease transmission in a rural locality of the Orinoco basin, Colombia

Erazo

Cordovez

2016

Parasites Vectors

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“…Certain aspects of T. infestan s behavior are well documented, such as feeding, resting, and circadian rhythms (Lazzari and Lorenzo 2009). However, very little is known about how much contact T. infestans have with each other under natural conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Triatomines typically emerge from their colonies at night to feed and return to the colony before dawn (Lorenzo and Lazzari 1998). Their refuges are typically dark, confined, and narrow (Lazzari and Lorenzo 2009). Such behaviors make insecticides that work through secondary exposure a promising strategy to control triatomines (Lazzari and Lorenzo 2009).…”

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Secondary Kill Effect of Deltamethrin on Triatoma infestans

et al. 2011

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Control of the Chagas disease vector, Triatoma infestans, relies on the application of pyrethroid insecticides, especially deltamethrin. We performed laboratory studies to determine whether a T. infestans nymph that comes into contact with a deltamethrin-treated surface horizontally transfers the insecticide to subsequent triatomines. We found that a triatomine that walks on a deltamethrin-treated surface for a short period of time has the ability to transport the insecticide in concentrations sufficient to kill other triatomines with which it comes into contact. The effect was limited to high-density environments, and mortality as a result of secondary exposure was greater among second-instar nymphs compared with fifth-instar nymphs. Our results suggest that deltamethrin could be killing triatomines through both direct and indirect contact, although it remains unclear whether the phenomenon occurs in natural conditions.

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“…Furthermore, recognition of the epidemiological importance of sylvatic and semi-domiciliated vectors indicates the requirement for permanent surveillance in order to avoid the resurgence of acute Chagas disease in our territory (Coura 2007, Guhl et al 2009, Lazzari & Lorenzo 2009). …”

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confidence: 99%

Chagas disease centennial anniversary celebration: historical overview and prospective proposals aiming to maintain vector control and improve patient prognosis - a permanent challenge

Lannes-Vieira¹,

Soeiro²,

Corrêa-Oliveira³

et al. 2009

Mem. Inst. Oswaldo Cruz

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EditorialChagas disease centennial anniversary celebration: historical overview and prospective proposals aiming to maintain vector control and improve patient prognosis -a permanent challengeThe organisation of the "International Symposium on the Centennial of the Discovery of Chagas Disease" (Rio de Janeiro, Brazil) is among the actions initiated by the Oswaldo Cruz Foundation to celebrate the centenary of the discovery of American trypanosomiasis by Carlos Chagas, in 1909. This Symposium comes at a time when discussions on new approaches for the control of this devastating disease are needed and it creates a unique opportunity for up-to-date presentations and debates from an assembly of eminent researchers from different countries. More than 650 participants, presenting about 300 posters, as well as 52 lectures and conferences, are expected at this meeting. This congregation of leading researchers gives us an historical opportunity to revisit the unique achievement of Carlos Chagas when he discovered a new nosology, as well as its vector and causative agent, the haemoflagellate protozoan Trypanosoma cruzi. He also described the entire life cycle and the pathology caused by this infectious agent. Furthermore, the question-based lectures and conferences create the propitious scenario for discussion of the plethora of information on the disease and for the reflection on proposals that contribute significantly to the advancement of knowledge in the field of Chagas disease, keeping in mind the importance of vector control maintenance and overall patient care, including early diagnosis, adequate follow up and therapy, aiming to improve both prognosis and quality of life.Here, we wish to thank the participants for their efforts and our colleagues for taking part in the discussions and presenting their findings during the lectures and round tables. Further, we thank the Scientific Committee, for the great suggestions that helped us to build this meeting, as well as all the referees that acted promptly to revise the manuscripts published herein, and the abstracts presented in the poster format during the Symposium. Furthermore, we are also in debt to the Oswaldo Cruz Foundation, ABRASCO, Fiotec, FAPERJ, CNPq and CAPES, for their support.

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Exploiting triatomine behaviour: alternative perspectives for their control

Cited by 32 publications

References 55 publications

Modeling the effects of palm-house proximity on the theoretical risk of Chagas disease transmission in a rural locality of the Orinoco basin, Colombia

Modeling the effects of palm-house proximity on the theoretical risk of Chagas disease transmission in a rural locality of the Orinoco basin, Colombia

Secondary Kill Effect of Deltamethrin on Triatoma infestans

Chagas disease centennial anniversary celebration: historical overview and prospective proposals aiming to maintain vector control and improve patient prognosis - a permanent challenge

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