The importance of vector control for the control and elimination of vector-borne diseases

Wilson, Anne L.; Courtenay, Orin; Kelly-Hope, Louise A.; Scott, Thomas W.; Takken, Willem; Torr, Stephen J.; Lindsay, Steve W.

doi:10.1371/journal.pntd.0007831

Cited by 409 publications

(319 citation statements)

References 133 publications

(113 reference statements)

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“…Improvement in surveillance systems allows better detection of the introduction of invasive Aedes species [3][4][5][6]. However, in the face of the new challenges posed by global environmental change and insecticide resistance, there is the need to develop a novel approach to mosquito control based on the One Health perspective rather than the insecticide-only approach [7,8]. For instance, in Italy, West Nile virus is managed through an annually revised plan aiming to reduce the risk of transmission to humans by early detection of viral circulation through surveillance not only in mosquitoes but also in birds and horses [9].…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Distribution of the Invasive Mosquito Aedes koreicus in a Temperate European City

Kurucz

Manica

Delucchi

et al. 2020

IJERPH

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Aedes koreicus is a mosquito species native to Asia that has recently successfully invaded new areas in several European countries. Here, we provide important data on Ae. koreicus establishment in Pécs (Southern Hungary). Mosquito surveillance was carried out weekly between 2016 and 2019 at 10 different sites located throughout the city from May to September. We conducted a statistical analysis to evaluate the most important abiotic factors driving Ae. koreicus abundance. We then calibrated a previously developed temperature-dependent mathematical model to the recorded captures to evaluate mosquito abundance in the study area. We found that too high summer temperatures negatively affect mosquito abundance. The model accurately replicated the observed capture patterns, providing an estimate of Ae. koreicus density for each breeding season, which we interpolated to map Ae. koreicus abundance throughout Pécs. We found a negative correlation between mosquito captures and human density, suggesting that Ae. koreicus does not necessarily require humans for its blood meals. Our study provides a successful application of a previously published mathematical model to investigate Ae. koreicus population dynamics, proving its suitability for future studies, also within an epidemiological framework.

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Section: Introductionmentioning

confidence: 99%

Dynamics and Distribution of the Invasive Mosquito Aedes koreicus in a Temperate European City

Kurucz

Manica

Delucchi

et al. 2020

IJERPH

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“…The occurrence of resistance to the IGR, most recently adopted class of insecticides, reinforces the importance of using integrated tools that can contribute to reducing the need for chemical vector control, modifying the determinants of arbovirus transmission in a sustainable manner, such as environmental management and education [35]. Consequently, lower use of chemical insecticides reduces the risk of factors associated such as ecological imbalance, outbreak of secondary pests, harmful effects to human health and to other non-target animals [36].…”

Section: Discussionmentioning

confidence: 99%

Assessment of the Susceptibility Status of Aedes aegypti (Diptera: Culicidae) Populations to Pyriproxyfen and Malathion in a National Wide Monitoring of Insecticide Resistance in Brazil, 2017-2018.

Campos¹,

Martins²,

Rodovalho³

et al. 2020

Preprint

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Abstract Background: In Brazil chemical control has been used since 1985. For the effectiveness of chemical control, it is essential to monitor the vector susceptibility to insecticides. This study aimed to describe bioassays standardization and to determine the susceptibility profile of Ae. aegypti populations to the products in use malathion and pyriproxyfen on national scale between 2017 and 2018, and to discuss the observed results impact in arboviruses control.Methods: The diagnostic-doses (DD) of pyriproxyfen and malathion were determined as the double of the inhibition of adult emergence (EI) and lethal doses for 99% of the Rockefeller reference strain, respectively. For the monitoring of natural populations, collections were performed in 132 Brazilian cities, through egg traps. Colonies were raised in the laboratory for one or two generations (F1 or F2) and submitted to susceptibility tests with larvae exposed to DD of pyriproxyfen (0.03 µg/L) and adults with the malathion DD herein obtained (20 µg), in addition to the World Health Organization (WHO) indicated DD (50 µg) in bottle assay. Dose-response bioassays with pyriproxyfen were performed with populations which did not achieved 98% EI in the DD assays. Results: Alteration of susceptibility to pyriproxyfen was recorded in 6 (4.5%) Ae. aegypti populations, with Resistance Ratio RR95 from 1.51 to 3.58. These populations were concentrated in Bahia and Ceará states. For malathion, 73 (55,3%) populations distributed all over the country were resistant when exposed to the local DD 20µg/bottle. On the other hand, no one population was resistant, and only 10 (7,6%) populations were considered with decreased susceptibility (mortality ratio between 90 and 98%) when the WHO DD (50 µg/bottle was used). These populations are in the 8 from 27 states.Conclusions: We evidenced the feasibility of conducting an insecticide resistance monitoring action at a national wide scale, employing standardized and strongly coordinated sampling methods and laboratory bioassays. We for the first time identified Brazilian Ae. aegypti populations with decreased susceptibility to pyriproxyfen. Local DD for malathion was more sensitive than the WHO DD to early detect decrease in susceptibility.

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“…The majority of samples with amplified esterases harboured between 2-10 gene copies. Individuals with more than 10 (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and more than 20 gene copies (in the case of one individual from Rethymno) were also recorded. Attica was the region with the highest percentage of individuals carrying ≥2 copies of either CCEae3a or CCEae6a gene (84% and 80%, respectively) and Chios of individuals with >10 copies (25% and 33.3%, respectively) ( Figure 2).…”

Section: Esterase Gene Amplificationmentioning

confidence: 99%

Phenotypic and molecular analysis of insecticide resistance in Aedes albopictus populations from Greece

Balaska¹,

Fotakis²,

Kioulos³

et al. 2020

Preprint

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Abstract Background: Aedes albopictus has a well-established presence in southern European countries, associated with recent disease outbreaks (e.g. Chikungunya). Development of insecticide resistance in the vector is a major concern as it’s control mainly relies on the use of biocides. Data on the specie’s resistance status is essential for efficient and sustainable control. Methods: We investigated the insecticide resistance status of several Ae. albopictus populations from Greece. Bioassays were performed against diflubenzuron (DFB), B. thuringiensis var. israelensis (Bti), deltamethrin and malathion. Molecular analysis of known insecticide resistance loci was performed, i.e. voltage-gated sodium channel (VGSC) mutations associated with pyrethroid resistance; presence and frequency of carboxylesterases 3 (CCEae3a) and 6 (CCEae6a) gene amplification associated with organophosphate (OP) resistance and; chitin synthase-1 (CHS-1) for the possible presence of DFB resistance mutations. Results: Bioassays showed full susceptibility to DFB, Bti and deltamethrin, but resistance against the OP malathion. VGSC analysis revealed a widespread distribution of mutations F1534C (in all populations, with allelic frequencies between 6.6% - 68.3%), and I1532T (in 6 populations), but absence of V1016G. CCE gene amplifications were recorded in 8 out of 11 populations. Co-presence of mutation F1534C and CCEae3a amplification was reported in a subgroup of samples. No mutations at the CHS locus I1043 were detected. Conclusions: The results indicate: (i) the suitability of larvicides DFB and Bti for Ae. albopictus control in Greece, (ii) a possible incipient pyrethroid resistance due to the presence of kdr mutations and (iii) a possible reduced efficacy of OPs, in a scenario of re-introducing them for vector control. The study highlights the need for systematic resistance monitoring for developing and implementing appropriate evidence-based control programs. Key words: diagnostic, arbovirus, mosquito tiger, insecticide resistance, vector control, Europe

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The importance of vector control for the control and elimination of vector-borne diseases

Cited by 409 publications

References 133 publications

Dynamics and Distribution of the Invasive Mosquito Aedes koreicus in a Temperate European City

Dynamics and Distribution of the Invasive Mosquito Aedes koreicus in a Temperate European City

Assessment of the Susceptibility Status of Aedes aegypti (Diptera: Culicidae) Populations to Pyriproxyfen and Malathion in a National Wide Monitoring of Insecticide Resistance in Brazil, 2017-2018.

Phenotypic and molecular analysis of insecticide resistance in Aedes albopictus populations from Greece

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