Incrimination of Anopheles (Anopheles) intermedius Peryassú, An. (Nyssorhynchus) nuneztovari Gabaldón, An. (Nys.) oswaldoi Peryassú as natural vectors of Plasmodium falciparum in French Guiana

Dusfour, Isabelle; Issaly, Jean; Carinci, Romuald; Gaborit, Pascal; Girod, Romain

doi:10.1590/s0074-02762012000300021

Cited by 37 publications

(32 citation statements)

References 25 publications

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“…Moreover, the necessary data are often incomplete and highly biased and, consequently, insufficient quantitatively and qualitatively for data-driven approaches [27,28], especially in these remote areas where epidemiological, entomological, and environmental Anopheles darlingi is considered as the principal vector of malaria in the Amazon region [5]. This species plays an evident role in malaria transmission in the Amapá State and in French Guiana, even if other species could be involved locally [6][7][8]. Its breeding sites are mainly the riverbanks and flooded areas, and the females usually exhibit a marked anthropophilic and exophilic behavior [9].…”

Section: Introductionmentioning

confidence: 99%

Mapping a Knowledge-Based Malaria Hazard Index Related to Landscape Using Remote Sensing: Application to the Cross-Border Area between French Guiana and Brazil

Roux

Dessay

et al. 2016

Remote Sensing

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Malaria remains one of the most common vector-borne diseases in the world and the definition of novel control strategies can benefit from the modeling of transmission processes. However, data-driven models are often difficult to build, as data are very often incomplete, heterogeneous in nature and in quality, and/or biased. In this context, a knowledge-based approach is proposed to build a robust and general landscape-based hazard index for malaria transmission that is tailored to the Amazonian region. A partial knowledge-based model of the risk of malaria transmission in the Amazonian region, based on landscape features and extracted from a systematic literature review, was used. Spatialization of the model was obtained by generating land use and land cover maps of the cross-border area between French Guiana and Brazil, followed by computing and combining landscape metrics to build a set of normalized landscape-based hazard indices. An empirical selection of the best index was performed by comparing the indices in terms of adequacy with the knowledge-based model, intelligibility and correlation with P. falciparum incidence rates. The selected index is easy to interpret and successfully represents the current knowledge about the role played by landscape patterns in malaria transmission within the study area. It was significantly associated with P. falciparum incidence rates, using the Pearson and Spearman correlation coefficients (up to 0.79 and 0.75, respectively; p-value < 0.001), and the linear regression coefficient of determination (reaching 0.63; p-values < 0.001). This study establishes a spatial knowledge-driven, landscape-based hazard malaria index using remote sensing that can be easily produced on a regular basis and might be useful for malaria prediction, surveillance, and control.Keywords: remote sensing; land use and land cover; landscape metric; knowledge-based hazard modeling; malaria; cross-border area between French Guiana and Brazil

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Section: Introductionmentioning

confidence: 99%

Mapping a Knowledge-Based Malaria Hazard Index Related to Landscape Using Remote Sensing: Application to the Cross-Border Area between French Guiana and Brazil

Roux

Dessay

et al. 2016

Remote Sensing

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“…This typology is encountered in many localities in French Guiana, from coastal to riparian and inland collection sites explaining the wide distribution of An. nuneztovari across the territory (Pajot et al 1978, Girod et al 2008, Dusfour et al 2012a, 2012b. Anopheles oswaldoi was mainly found in Camopi, the most forested site, which Figure 2.…”

Section: Discussionmentioning

confidence: 99%

“…nuneztovari, and An. oswaldoi are able to transmit P. falciparum parasites in the same study localities (Dusfour et al 2012a). Additionnal investigation will be required to better describe human behaviors and to fully determine which anopheline species are responsible for disease in a given locality.…”

Section: Discussionmentioning

confidence: 99%

“…Apart from An. darlingi, other anophelines suspected to be primary or secondary vectors in different parts of South America (Mouchet et al 2004) have been collected in French Guiana and their infection by Plasmodium species demonstrated (Dusfour et al 2012a). Among them, An.…”

Section: Introductionmentioning

confidence: 99%

“…intermedius and An. oswaldoi s.l., often described as occasional vectors (Mouchet et al 2004), were found infected with P. falciparum in different villages of French Guiana (Dusfour et al 2012a). On the other hand, An.aquasalis, An.…”

Section: Introductionmentioning

confidence: 99%

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A survey of adult anophelines in French Guiana: enhanced descriptions of species distribution and biting responses

Dusfour

Carinci

Issaly

et al. 2013

Journal of Vector Ecology

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In French Guiana, Anopheles darlingi is considered the main malaria vector. However, several reports have hypothesized the implication of other anopheline species in malaria transmission for the territory. Data on the ecology of these other potential vectors is rare or even unexplored in French Guiana. The aim of this study was to describe the biting habits of several anopheline species in multiple localities in French Guiana. Six sampling sites yielded 1,083 anopheline adults. Results indicated the presence of An. darlingi in all study locations and it was the only species to be collected inside villages. Other anophelines collected included An. aquasalis, An. braziliensis, An. intermedius, An. mediopunctatus, An. nuneztovari, An. oswaldoi, and An. triannulatus, all of which were associated with open areas and forests. The environment and time, at which biting behavior was recorded, varied for each species. It was noted that An. oswaldoi showed a daytime rhythm in open areas. This study is the first to report on the biting habits of a range of anophelines in French Guiana that may play a role in malaria transmission. This information is vital to fully describe the risk of malaria transmission and thereby design appropriate vector control measures and malaria prevention programs. Journal of Vector Ecology 38 (2): 203-209. 2013.

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Using capillary electrophoresis to identify Anopheline species in routine sampling sites

Chabanol,

Romoli,

Talaga

et al. 2024

Ecology and Evolution

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In the Anopheles genus, various mosquito species are able to transmit the Plasmodium parasites responsible for malaria, while others are non‐vectors. In an effort to better understand the biology of Anopheles species and to quantify transmission risk in an area, the identification of mosquito species collected in the field is an essential but problematic task. Morphological identification requires expertise and cannot be checked after processing samples in a destructive treatment, while sequencing of numerous samples is costly. Here, we introduce a method of Species identification via Simple Observation Coupled with Capillary Electrophoresis Technology (SOCCET). This molecular technique of species identification is based on precise determination of ITS2 length combined with a simple visual observation, the colour of mosquito hindleg tip. DNA extracted from field‐collected Anopheles mosquitoes was amplified with universal Anopheles ITS2 primers and analysed with a capillary electrophoresis device, which precisely determines the size of the fragments. We defined windows of amplicon sizes combined with fifth hind tarsus colour, which allows discrimination of the major Anopheles species found in our collections. We validated our parameters via Sanger sequencing of ITS2 amplicons. Using the SOCCET method, we characterised the composition of Anopheles populations in five locations of French Guiana, where we detected a total of nine species. Anopheles braziliensis and Anopheles darlingi were detected in four locations each and represented 13 and 67% of our samples, respectively. The SOCCET method can be particularly useful when working with routine sampling sites with a moderate species diversity, that is, when the number of local species is too high to define species‐specific primers but low enough to avoid individual ITS2 sequencing. This tool will be of interest to evaluate local malaria transmission risk and this approach may be further implemented for other mosquito genera.

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Incrimination of Anopheles (Anopheles) intermedius Peryassú, An. (Nyssorhynchus) nuneztovari Gabaldón, An. (Nys.) oswaldoi Peryassú as natural vectors of Plasmodium falciparum in French Guiana

Cited by 37 publications

References 25 publications

Mapping a Knowledge-Based Malaria Hazard Index Related to Landscape Using Remote Sensing: Application to the Cross-Border Area between French Guiana and Brazil

Mapping a Knowledge-Based Malaria Hazard Index Related to Landscape Using Remote Sensing: Application to the Cross-Border Area between French Guiana and Brazil

A survey of adult anophelines in French Guiana: enhanced descriptions of species distribution and biting responses

Using capillary electrophoresis to identify Anopheline species in routine sampling sites

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