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anopheles arabiensis

Intraspecific transcriptome variation and sex-biased expression in Anopheles arabiensis

September 1, 2021 - 15:52 -- Open Access
Author(s): 
Jayaswal V, Ndo C, Ma HC, Clifton B, Pombi M, Cabrera K, Couhet A, Mouline K, Diabaté A, Dabiré R, Ayala D, Ranz JM
Reference: 
Genome Biol Evol. 2021 Aug 25:evab199

The magnitude and functional patterns of intraspecific transcriptional variation in the anophelines, including those of sex-biased genes underlying sex-specific traits relevant for malaria transmission, remain understudied. As a result, how changes in expression levels drive adaptation in these species is poorly understood. We sequenced the female, male, and larval transcriptomes of three populations of Anopheles arabiensis from Burkina Faso.

The effect of cattle-administered ivermectin and fipronil on the mortality and fecundity of Anopheles arabiensis Patton

July 6, 2021 - 14:25 -- Open Access
Author(s): 
Makhanthisa TI, Braack L, Lutermann H
Reference: 
Parasit Vectors. 2021 Jul 2;14(1):349

Malaria control primarily depends on two vector control strategies: indoor residual spraying (IRS) and long-lasting insecticide-treated nets (LLINs). Both IRS and LLIN target indoor-biting mosquitoes. However, some of the most important malaria vectors have developed resistance against the chemical compounds used in IRS and LLINs. Insecticide-induced behavioural changes in vectors, such as increased outdoor feeding on cattle and other animals, also limit the effectiveness of these strategies. Novel vector control strategies must therefore be found to complement IRS and LLINs. A promising tool is the use of cattle-applied endectocides. Endectocides are broad-spectrum systemic drugs that are effective against a range of internal nematodes parasites and blood-feeding arthropods. The aim of this study was to investigate the effect of two endectocide drugs, injectable ivermectin and topical fipronil, on the survival and fecundity of zoophilic Anopheles arabiensis.

Insecticide resistance status of Anopheles arabiensis in irrigated and non-irrigated areas in western Kenya

June 29, 2021 - 14:15 -- Open Access
Author(s): 
Orondo PW, Nyanjom SG, Yan G, et al.
Reference: 
Parasit Vectors. 2021 Jun 26;14(1):335

Malaria control in Kenya is based on case management and vector control using long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS). However, the development of insecticide resistance compromises the effectiveness of insecticide-based vector control programs. The use of pesticides for agricultural purposes has been implicated as one of the sources driving the selection of resistance. The current study was undertaken to assess the status and mechanism of insecticide resistance in malaria vectors in irrigated and non-irrigated areas with varying agrochemical use in western Kenya.

Additional evidence on the efficacy of different Akirin vaccines assessed on Anopheles arabiensis (Diptera: Culicidae)

April 22, 2021 - 08:15 -- Open Access
Author(s): 
Letinić BD, Contreras M, Dahan-Moss Y, Linnekugel I, de la Fuente J, Koekemoer LL
Reference: 
Parasit Vectors. 2021 Apr 20;14(1):209

Anopheles arabiensis is an opportunistic malaria vector that rests and feeds outdoors, circumventing current indoor vector control methods. Furthermore, this vector will readily feed on both animals and humans. Targeting this vector while feeding on animals can provide an additional intervention for the current vector control activities. Previous results have displayed the efficacy of using Subolesin/Akirin ortholog vaccines for the control of multiple ectoparasite infestations. This made Akirin a potential antigen for vaccine development against An. arabiensis.

Estimates of the population size and dispersal range of Anopheles arabiensis in Northern KwaZulu-Natal, South Africa: implications for a planned pilot programme to release sterile male mosquitoes

April 20, 2021 - 15:45 -- Open Access
Author(s): 
Kaiser ML, Wood OR, Damiens D, Brooke BD, Koekemoer LL, Munhenga G
Reference: 
Parasit Vectors. 2021 Apr 19;14(1):205

Anopheles arabiensis is a major malaria vector, recently implicated as contributing to ongoing residual malaria transmission in South Africa, which feeds and rests both indoors and outdoors. This species is, therefore, not effectively targeted using core malaria vector control interventions alone. Additionally, increasing resistance to available insecticides necessitates investigations into complementary non-insecticide-based vector control methods for outdoor-resting mosquitoes. The feasibility of the sterile insect technique (SIT) as a complementary vector control intervention is being investigated in South Africa. Successful implementation of an SIT programme largely depends on inundating a target insect population with sterilized laboratory-bred males. Therefore, knowledge of the native population size and dispersal ability of released sterile laboratory-reared males is critical. In this study, we estimated the male An. arabiensis population size and the dispersal of released males in an area targeted for a pilot sterile male release programme.

Status of insecticide susceptibility in Anopheles arabiensis and detection of the knockdown resistance mutation (kdr) concerning agricultural practices from Northern Sudan state, Sudan

March 30, 2021 - 14:26 -- Open Access
Author(s): 
Korti MY, Ageep TB, Adam AI, Shitta KB, Hassan AA, Algadam AA, Baleela RM, Saad HA, Abuelmaali SA
Reference: 
J Genet Eng Biotechnol. 2021 Mar 29;19(1):49

Chemical control has been the most efficient method in mosquito control, the development of insecticide resistance in target populations has a significant impact on vector control. The use of agricultural pesticides may have a profound impact on the development of resistance in the field populations of malaria vectors. Our study focused on insecticide resistance and knockdown resistance (kdr) of Anopheles arabiensis populations from Northern Sudan, related to agricultural pesticide usage.

Anopheles arabiensis hotspots along intermittent rivers drive malaria dynamics in semi-arid areas of Central Ethiopia

March 18, 2021 - 09:31 -- Open Access
Author(s): 
Kasahun Eba, Tibebu Habtewold, Delenasaw Yewhalaw, George K. Christophides and Luc Duchateau
Reference: 
Malaria Journal 2021 20:154, 17 March 2021

Understanding malaria vector’s population dynamics and their spatial distribution is important to define when and where the largest infection risks occur and implement appropriate control strategies. In this study, the seasonal spatio-temporal dynamics of the malaria vector population and transmission intensity along intermittent rivers in a semi-arid area of central Ethiopia were investigated.

Chromosome-level genome assemblies of the malaria vectors Anopheles coluzzii and Anopheles arabiensis

March 17, 2021 - 16:50 -- Open Access
Author(s): 
Zamyatin A, Avdeyev P, Liang J, Sharma A, Chen C, Lukyanchikova V, Alexeev N, Tu Z, Alekseyev MA, Sharakhov IV
Reference: 
Gigascience. 2021 Mar 15;10(3):giab017

Anopheles coluzzii and Anopheles arabiensis belong to the Anopheles gambiae complex and are among the major malaria vectors in sub-Saharan Africa. However, chromosome-level reference genome assemblies are still lacking for these medically important mosquito species.

Malaria in migrant agricultural workers in western Ethiopia: entomological assessment of malaria transmission risk

February 17, 2021 - 09:09 -- Open Access
Author(s): 
Sisay Dugassa, Mathew Murphy, Sheleme Chibsa, Yehualashet Tadesse, Gedeon Yohannes, Lena M. Lorenz, Hiwot Solomon, Delenasaw Yewhalaw and Seth R. Irish
Reference: 
Malaria Journal 2021 20:95, 16 February 2021

Ethiopia has made great strides in malaria control over the last two decades. However, this progress has not been uniform and one concern has been reported high rates of malaria transmission in large agricultural development areas in western Ethiopia. Improved vector control is one way this transmission might be addressed, but little is known about malaria vectors in this part of the country.

Spatial Anopheles arabiensis (Diptera: Culicidae) insecticide resistance patterns across malaria-endemic regions of Botswana

November 24, 2020 - 13:44 -- Open Access
Author(s): 
Mmabaledi Buxton, Ryan J. Wasserman and Casper Nyamukondiwa
Reference: 
Malaria Journal 2020 19:415, 19 November 2020

Since the advent of the Green Revolution, pesticides have played an important role in the global management of invertebrate pests including vector mosquitoes. Despite optimal efficacy, insects often display insensitivity to synthetic insecticides owing to prolonged exposure that may select for resistance development. Such insecticide insensitivity may regress national and regional coordination in mosquito vector management and indeed malaria control. In Botswana, prolonged use of synthetic insecticides against malaria vectors have been practiced without monitoring of targeted mosquito species susceptibility status.

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