Re-infestation of houses by Triatoma dimidiata after intra-domicile insecticide application in the Yucatán peninsula, Mexico

Dumonteil, Eric; Ruiz‐Piña, Hugo A.; Rodriguez-Félix, Eugenia; Barrera-Pérez, Mario; Ramírez-Sierra, María Jesús; Rabinovich, Jorge E.; Menu, Frédéric

doi:10.1590/s0074-02762004000300002

Cited by 73 publications

(42 citation statements)

References 25 publications

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“…Indeed, it is now well established that the efficacy of conventional insecticide spraying is short-lived in the case of non-domiciliated triatomines seasonally infesting houses. [28][29][30][31] Previous control efforts in Veracruz indicated that three insecticide applications 8 months apart were required to reduce T. dimidiata infestation, 32 but there was no follow-up to assess potential re-infestation after interrupting control interventions. Re-infestation by T. dimidiata following insecticide spraying has been frequently observed in the Yucatan peninsula, Mexico, 28,31 as well as in Guatemala.…”

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confidence: 99%

“…[28][29][30][31] Previous control efforts in Veracruz indicated that three insecticide applications 8 months apart were required to reduce T. dimidiata infestation, 32 but there was no follow-up to assess potential re-infestation after interrupting control interventions. Re-infestation by T. dimidiata following insecticide spraying has been frequently observed in the Yucatan peninsula, Mexico, 28,31 as well as in Guatemala. 33 Thus, alternative control interventions focusing on non-domiciliated triatomines 30,31 may be more appropriate for the region, and more generally, for all or most of the taxonomic groups of the T. dimidiata complex.…”

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confidence: 99%

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House Infestation Dynamics and Feeding Sources of Triatoma dimidiata in Central Veracruz, Mexico

Torres-Montero

López‐Monteon²,

Dumonteil³

et al. 2012

The American Society of Tropical Medicine and Hygiene

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Abstract. Chagas disease is endemic in the state of Veracruz, Mexico, and we investigated here the dynamics of house infestation by Chagas disease vectors to understand disease transmission and design effective control interventions. Bug collections in 42 rural villages confirmed the widespread distribution of Triatoma dimidiata in central Veracruz. Unexpectedly, collection data further indicated a clear pattern of seasonal infestation by mostly adult bugs. Analysis of feeding sources with a polymerase chain reaction-heteroduplex assay indicated a frequent feeding on humans, in agreement with the high seroprevalence previously observed. Feeding sources also confirmed a significant dispersal of bugs between habitats. High dispersal capabilities and seasonal infestation may thus be a shared characteristic of several of the T. dimidiata sibling species from this complex. It would thus be critical to adapt vector control interventions to this behavior to improve their efficacy and sustainability, as the control of T. dimidiata has been notoriously challenging.

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confidence: 99%

House Infestation Dynamics and Feeding Sources of Triatoma dimidiata in Central Veracruz, Mexico

Torres-Montero

López‐Monteon²,

Dumonteil³

et al. 2012

The American Society of Tropical Medicine and Hygiene

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“…15,30 Understanding the mechanism of reinfestation is crucial to formulating an effective post-spray control strategy for T. dimidiata. Theoretically, reinfestation can occur in two ways: 1) vectors survive the insecticide treatment or 2) vectors migrate to treated houses after spraying.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of Large-Scale Chagas Disease Vector Control Program in Nicaragua by Residual Insecticide Spraying Against Triatoma dimidiata

Yoshioka¹,

Nakamura²,

Pérez³

et al. 2015

The American Society of Tropical Medicine and Hygiene

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Abstract. Chagas disease is one of the most serious health problems in Latin America. Because the disease is transmitted mainly by triatomine vectors, a three-phase vector control strategy was used to reduce its vector-borne transmission. In Nicaragua, we implemented an indoor insecticide spraying program in five northern departments to reduce house infestation by Triatoma dimidiata. The spraying program was performed in two rounds. After each round, we conducted entomological evaluation to compare the vector infestation level before and after spraying. A total of 66,200 and 44,683 houses were sprayed in the first and second spraying rounds, respectively. The entomological evaluation showed that the proportion of houses infested by T. dimidiata was reduced from 17.0% to 3.0% after the first spraying, which was statistically significant (P < 0.0001). However, the second spraying round did not demonstrate clear effectiveness. Space-time analysis revealed that reinfestation of T. dimidiata is more likely to occur in clusters where the pre-spray infestation level is high. Here we discuss how large-scale insecticide spraying is neither effective nor affordable when T. dimidiata is widely distributed at low infestation levels. Further challenges involve research on T. dimidiata reinfestation, diversification of vector control strategies, and implementation of sustainable vector surveillance.

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“…When triatomine populations are present in domestic, peri-domestic and sylvatic ecotopes, and gene flow among ecotopes is significant, insecticide spraying is of limited efficacy (Dumonteil et al, 2004;Barbu et al, 2009), likely because populations can be rapidly rebuilt by migrants. Thus, the control of such non-domiciliated or autochthonous triatomines remains a major problem for vector control , and novel approaches such as screens, bednets and house improvements will be necessary to interrupt transmission (Figure 4) (Monroy et al, 1998(Monroy et al, , 2009Barbu et al, 2009Barbu et al, , 2011Ferral et al, 2010).…”

Section: Triatomine Species Interactionmentioning

confidence: 99%

Genetics and evolution of triatomines: from phylogeny to vector control

et al. 2011

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Triatomines are hemipteran bugs acting as vectors of the protozoan parasite Trypanosoma cruzi. This parasite causes Chagas disease, one of the major parasitic diseases in the Americas. Studies of triatomine genetics and evolution have been particularly useful in the design of rational vector control strategies, and are reviewed here. The phylogeography of several triatomine species is now slowly emerging, and the struggle to reconcile the phenotypic, phylogenetic, ecological and epidemiological species concepts makes for a very dynamic field. Population genetic studies using different markers indicate a wide range of population structures, depending on the triatomine species, ranging from highly fragmented to mobile, interbreeding populations. Triatomines transmit T. cruzi in the context of complex interactions between the insect vectors, their bacterial symbionts and the parasites; however, an integrated view of the significance of these interactions in triatomine biology, evolution and in disease transmission is still lacking. The development of novel genetic markers, together with the ongoing sequencing of the Rhodnius prolixus genome and more integrative studies, will provide key tools to expanding our understanding of these important insect vectors and allow the design of improved vector control strategies.

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Re-infestation of houses by Triatoma dimidiata after intra-domicile insecticide application in the Yucatán peninsula, Mexico

Cited by 73 publications

References 25 publications

House Infestation Dynamics and Feeding Sources of Triatoma dimidiata in Central Veracruz, Mexico

House Infestation Dynamics and Feeding Sources of Triatoma dimidiata in Central Veracruz, Mexico

Effectiveness of Large-Scale Chagas Disease Vector Control Program in Nicaragua by Residual Insecticide Spraying Against Triatoma dimidiata

Genetics and evolution of triatomines: from phylogeny to vector control

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