scholarly journals Les propriétés biotiques et abiotiques des gîtes larvaires d’Aedes aegypti et leur influence sur les traits de vie des adultes (synthèse bibliographique)

2021 ◽  
pp. 57-71
Author(s):  
Lyza Hery ◽  
Antoine Boullis ◽  
Anubis Vega-Rúa
Keyword(s):  
Aedes Aegypti ◽  
Sont Encore ◽  
Large Panel ◽  
Gîtes Larvaires ◽  
Gîte Larvaire

Introduction. Le moustique Aedes aegypti, vecteur majeur d’arbovirus, se développe dans un large panel de réservoirs artificiels en zone urbaine. Ces gîtes larvaires sont exposés à des conditions biotiques et abiotiques variables pouvant influencer la capacité vectorielle du moustique adulte et, par conséquent, le risque de transmission de pathogènes. Ici, nous recensons l’état des connaissances sur les propriétés physico-chimiques et microbiologiques des habitats aquatiques d’Ae. aegypti qui affectent le comportement de pré-oviposition, le développement et la capacité à transmettre les virus de ce Culicidae. Littérature. La grande variabilité spatio-temporelle des propriétés abiotiques et biotiques des gîtes d’Ae. aegypti rend complexe leur caractérisation. Certains facteurs biotiques (matière organique, larves congénères, microbiote) et abiotiques (salinité, température, pH) des gîtes ont des effets forts et directs sur le développement des larves et se répercutent sur les caractéristiques physiologiques et morphologiques du moustique adulte telles que la taille, la fécondité, la longévité et sa capacité vectorielle. Conclusions. Au vu de l’influence du gîte larvaire, et notamment de son microbiote, sur des nombreux traits phénotypiques chez Ae. aegypti, des efforts sont encore requis pour mieux comprendre comment la variabilité naturelle des gîtes façonne la capacité vectorielle des populations de cette espèce invasive à travers le globe.

scholarly journals Odorant receptors from Culex quinquefasciatus and Aedes aegypti sensitive to floral compounds

2019 ◽  
Author(s):  
Fangfang Zeng ◽  
Pingxi Xu ◽  
Walter S. Leal
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Olfactory System ◽  
Recording System ◽  
Odorant Receptors ◽  
Transcript Levels ◽  
Linalool Oxide ◽  
Large Panel ◽  
Phenethyl Propionate ◽  
Repellency Activity

AbstractMosquitoes rely heavily on the olfactory system to find a host for a bloodmeal, plants for a source of energy and suitable sites for oviposition. Here, we examined a cluster of 8 odorant receptors (ORs), which includes one OR, CquiOR1, previously identified to be sensitive to plant-derived compounds. We cloned 5 ORs from Culex quinquefasciatus and 2 ORs from Aedes aegypti, ie, CquiOR2, CquiOR4, CquiOR5, CquiOR84, CquiOR85, AaegOR14, and AaegOR15 and then deorphanized these receptors using the Xenopus oocyte recording system and a large panel of odorants. 2-Phenylethanol, phenethyl formate, and phenethyl propionate were the best ligands for CquiOR4 somewhat resembling the profile of AaegOR15, which gave the strongest responses to phenethyl propionate, phenethyl formate, and acetophenone. In contrast, the best ligands for CquiOR5 were linalool, PMD, and linalool oxide. CquiOR4 was predominantly expressed in antennae of nonblood fed female mosquitoes, with transcript levels significantly reduced after a blood meal. 2-Phenylethanol showed repellency activity comparable to that of DEET at 1%. RNAi experiments suggest that at least in part 2-phenylethanol-elicited repellency is mediated by CquiOR4 activation.

GAMBARAN INDEKS LARVA AEDES AEGYPTI DI BUFFER WILAYAH KERJA BANDARA SEPINGGAN BALIKPAPAN

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Abdurrakhman abdurrakhman Abdurrakhman
Keyword(s):  
Aedes Aegypti ◽  
Buffer Zone ◽  
Chi Square ◽  
Cross Sectional ◽  
Breeding Sites ◽  
Dengue Disease ◽  
Vector Borne Diseases ◽  
Transportation Equipment ◽  
Chi Square Test ◽  
Larvae Density

ABSTRACT : The House index and Container Index in the buffer area of ​​the working area of ​​Balikpapan Sepinggan Airport is still above 1%, so the potential for the spread of dengue disease. Mobilization of people, goods and transportation equipment will increasingly affect the transmission of disease in ports and airports, especially for vector-borne diseases. This study aims to analyze the risk factors associated with larvae density of Aedes aegypti and describe the larvae index in the buffer zone of the Sepinggan Balikpapan Airport This study was a descriptive study with a cross sectional design. The sample in this study was 121 houses with a proportionate stratified random sampling, the research location was in the buffer zone of Sepinggan Balikpapan Airport in November 2018. The variables studied were houses with positive larvae containers, breeding sites and PSN behavior and larvasidation. The data was analyzed using the chi square test. There was a relationship between houses with larvae positive Aedes aegypti, behavior of Mosquito Nest Eradication (PSN) and larvasidation with larvae density of Aedes aegypti but not for breeding sites (p = 0.00 and 95% CI = 0.64), and   (p = 0.00 and 95% CI = 0.34). The description of several Aedes aegypti larvae index, namely House Index (HI) = 57.02%, Container Index (CI) = 24.36%, Bruteau Index (BI) = 148.76, and Flick Free Numbers (ABJ) = 42.98 %. Houses with larvae of Aedes aegypti larvae and PSN and larvasidation behavior were associated with larvae density of Aedes aegypti. The index of HI, CI and BI larvae is of high value so there is a risk of DBD transmission

Detection of dengue virus in Aedes mosquitoes in Delhi, India

ENTOMON ◽  
2019 ◽  
Vol 44 (3) ◽  
pp. 213-218
Author(s):  
Suresh Chand Kaushik ◽  
Sukhvir Singh ◽  
Purnima Srivastava ◽  
R. Rajendran
Keyword(s):  
Early Intervention ◽  
Early Detection ◽  
Aedes Aegypti ◽  
Dengue Virus ◽  
Infection Rate ◽  
Transmission Season ◽  
Aedes Mosquitoes ◽  
Alternative Approach ◽  
Human Sera ◽  
Minimum Infection Rate

Detection of viruses in human sera particularly in endemic areas is cumbersome and laborious. Therefore, an alternative approach, Immuno-fluorescence assay (IFA) was performed to determine dengue virus (DENV) positivity in mosquitoes. A total of 1055 adult Aedes aegypti female mosquitoes were tested for IFA test against DENV. Minimum infection rate (MIR) for DENV was found higher during August to November 2016 ranging from 10.75 to 20.83. The average yearly MIR was about 6.64. Higher MIR for Ae. aegypti was found in Sarfabad, Noida (12.71) and Khoda Colony, Ghaziabad (11.90). Minimum MIR (4.67) was observed in Sanjay colony (Faridabad). The main contribution of this study resides in the development of a more suitable monitoring system for early detection of viral circulation and to prioritize early intervention in the non-transmission season.

Distribution of Aedes aegypti and Aedes albopictus in different eco zones of Thiruvananthapuram city with special reference to dengue viremia in humans

ENTOMON ◽  
2018 ◽  
Vol 43 (4) ◽  
pp. 223-230
Author(s):  
S. Sunil Kumar ◽  
D.A. Evans ◽  
K. Muthulakshmi ◽  
T. DilipKumar ◽  
R. Heera Pillai ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Dengue Shock Syndrome ◽  
Single Step ◽  
Equal Distribution ◽  
Distribution Study ◽  
Urban Zone ◽  
High Prevalence ◽  
Vector Management ◽  
Efficient Vector

Mosquito index study of three ecologically different ecozones of the Thiruvananthapuram district, Kerala showed sharp difference on the proportionate distribution of Aedes aegypti and Aedes albopictus. Human dengue viremia (HDV) was very high in those ecozones where A.aegypti density was high and HDV was low where A.albopictus was high. In a coastal zone of Thiruvananthapuram city, A. aegypti was the most abundant vector and in a hilly, arid suburban zone, A.albopictus was the abundant vector. In the urban zone both species of mosquitoes showed equal distribution. Study on the circulating serotypes in the serum of HDV by Single step single tube Multiplex PCR showed all the four serotypes viz DENV1, DENV2, DENV3 and DENV4 in patients of Thiruvananthapuram city, which indicated the possibility of Dengue Shock Syndrome, unless there is efficient vector management. Among the four dengue serotypes, Type 1 was the most abundant virus. Abundance of microhabitats in Thiruvananthapuram city, which support A. aegypti may be the reason for high prevalence of dengue fever in the urban zone.

A philosophy for structural integrity of large panel buildings

PCI Journal ◽  
1976 ◽  
Vol 21 (3) ◽  
pp. 46-69 ◽  
Author(s):  
Mark Fintel ◽  
Donald M. Schultz
Keyword(s):  
Structural Integrity ◽  
Large Panel
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