Biology of two larval morphological phenotypes of<i>Aedes aegypti</i>in Abidjan, Côte d'Ivoire

Guindo‐Coulibaly, Négnorogo; Diakité, Nana R.; Adja, Akré Maurice; Coulibaly, Jean T.; Bassa, K.F.; Konan, Y. L.; N'Goran, K.E.

doi:10.1017/s0007485317001109

Cited by 5 publications

(7 citation statements)

References 21 publications

(23 reference statements)

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“…At the time of hatching, the chorion was ruptured due to the larval muscle activity, which increased in volume and consequently increased the pressure exerted from the spike, a specialized structure; then the rupture of the chorion occurred, from a crack in the part corresponding to the cited coating [32,39]. This description was verified in this study (Fig.…”

Section: Discussionsupporting

confidence: 74%

Aedes aegypti: egg morphology and embryonic development

et al. 2021

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Background The diseases for which Aedes aegypti is a vector are worrisome. The high vector competence of this mosquito, as well as its anthropophilia and ability to adapt to the urban environment, allows it to exploit many habitats, making its prevention an arduous task. Despite current disease control measures focused on the mosquito, the effectiveness in containing its dispersion still requires improvement; thus greater knowledge about this insect is fundamental. Methods Aedes aegypti egg morphology and embryonic development were analyzed from eggs of the insectary of the Institute of Biomedical Sciences of the University of São Paulo. Optical (light and confocal) and electronic (transmission and scanning) microscopy were used to analyze the morphological and ultrastructural features of the eggs. Embryos were observed in the initial (0–20.5 h after egg-laying), intermediate (20.6–40.1 h after egg-laying), and final (40.2–61.6 h) stages of development, and kept at a temperature of 28 °C ± 1 °C until collection for processing. Results Eggs of Ae. aegypti were whitish at the time of oviposition, and then quickly became black. The egg length was 581.45 ± 39.73 μm and the width was 175.36 ± 11.59. Access to the embryo was difficult due to the egg morphology, point of embryonic development, and difficult permeability of the exochorion (mainly in fixation). Only about 5% of the collected eggs were successfully processed. In the initial stage of embryonic development, characteristics suggestive of intense cellular activity were found. In the intermediate stage, the beginning of the segmentation process was evident. In the final phase, it was possible to differentiate the cephalic region and the thoracic and abdominal segments. Conclusion The chorion was found to be an important protective barrier and a limiting factor for the evaluation of the embryos and mosquito embryonic cells, indicating that further studies need to be carried out to identify the reason that this occurs. Graphical abstract

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Section: Discussionsupporting

confidence: 74%

Aedes aegypti: egg morphology and embryonic development

et al. 2021

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“…Thus, an assumption that at least 50% feed at least twice results in a mean of 1.5 bites per GCD. Several recent studies [ 42 , 43 ] studying Ae . aegypti across the globe reported the duration of the gonotrophic cycle as between 3 to 4 days.…”

Section: Resultsmentioning

confidence: 99%

The biting rate of Aedes aegypti and its variability: A systematic review (1970–2022)

et al. 2023

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Background Transmission models have a long history in the study of mosquito-borne disease dynamics. The mosquito biting rate (MBR) is an important parameter in these models, however, estimating its value empirically is complex. Modeling studies obtain biting rate values from various types of studies, each of them having its strengths and limitations. Thus, understanding these study designs and the factors that contribute to MBR estimates and their variability is an important step towards standardizing these estimates. We do this for an important arbovirus vector Aedes aegypti. Methodology/Principal findings We perform a systematic review using search terms such as ‘biting rate’ and ‘biting frequency’ combined with ‘Aedes aegypti’ (‘Ae. aegypti’ or ‘A. aegypti’). We screened 3,201 articles from PubMed and ProQuest databases, of which 21 met our inclusion criteria. Two broader types of studies are identified: human landing catch (HLC) studies and multiple feeding studies. We analyze the biting rate data provided as well as the methodologies used in these studies to characterize the variability of these estimates across temporal, spatial, and environmental factors and to identify the strengths and limitations of existing methodologies. Based on these analyses, we present two approaches to estimate population mean per mosquito biting rate: one that combines studies estimating the number of bites taken per gonotrophic cycle and the gonotrophic cycle duration, and a second that uses data from histological studies. Based on one histological study dataset, we estimate biting rates of Ae. aegypti (0.41 and 0.35 bite/mosquito-day in Thailand and Puerto Rico, respectively. Conclusions/Significance Our review reinforces the importance of engaging with vector biology when using mosquito biting rate data in transmission modeling studies. For Ae. aegypti, this includes understanding the variation of the gonotrophic cycle duration and the number of bites per gonotrophic cycle, as well as recognizing the potential for spatial and temporal variability. To address these variabilities, we advocate for site-specific data and the development of a standardized approach to estimate the biting rate.

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“…Two population types of Ae. aegypti (white and brown populations) examined in Cote D'ivoire, both populations were resistant to DDT ( 19 , 20 ). Nine populations tested of Ae.…”

Section: Resultsmentioning

confidence: 99%

Worldwide Status of Insecticide Resistance of Aedes aegypti and Ae. albopictus, Vectors of Arboviruses of Chikungunya, Dengue, Zika and Yellow Fever

Asgarian,

Vatandoost,

Hanafi-Bojd

et al. 2023

JAD

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Background: Controlling of Aedes aegypti and Ae. albopictus, vectors of five important mosquito-borne diseases, is known as the most effective method to prevent the transmission of arboviruses to humans, but the emergence of insecticide resistance is threat for control and prevention of vector borne diseases. A better understanding of mosquito resistance to insecticides will help to develop more effective methods to control insecticide resistance in mosquito vectors. Methods: Worldwide geographical distribution of insecticide resistance in Ae. aegypti and Ae. albopictus by the available papers and map of the data for carbamates, organochlorines, organophosphates, pyrethroids, microbial and insect growth regulator insecticides were reviewed. Article data published up to December 2022 were investigated by searching the following databases: "Google Scholar", "PubMed", "Scopus", "SID" and "Web of Knowledge". Results: The results showed that the susceptibility and resistance status of Ae. aegypti and Ae. albopictus to insecticides in the world is very diverse. Conclusion: Due to the importance of Ae. aegypti and Ae. albopictus in the transmission of mosquito-borne arboviruses, resistance management should be given more attention worldwide to prevent insecticide resistance in the arbovirus vector and replace the new approach for vector control.

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Biology of two larval morphological phenotypes ofAedes aegyptiin Abidjan, Côte d'Ivoire

Cited by 5 publications

References 21 publications

Aedes aegypti: egg morphology and embryonic development

Aedes aegypti: egg morphology and embryonic development

The biting rate of Aedes aegypti and its variability: A systematic review (1970–2022)

Worldwide Status of Insecticide Resistance of Aedes aegypti and Ae. albopictus, Vectors of Arboviruses of Chikungunya, Dengue, Zika and Yellow Fever

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