Experimental Transmission and Field Isolation Studies Implicating Culex Pipiens as a Vector of Rift Valley Fever Virus in Egypt

Meegan, James M.; Khalil, Galila M.; Hoogstraal, Harry; Adham, Fatma K.

doi:10.4269/ajtmh.1980.29.1405

Cited by 131 publications

(78 citation statements)

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“…Testing in pools additionally increases the risk of sampling errors resulting from misidentification of a single mosquito or the introduction of contamination during pooling, sampling or handling the mosquitoes; a single positive leg is sufficient to cause a false positive [98]. The inclusion of engorged mosquitoes can also cause false positives as virus can be present in the blood meal of a refractory mosquito [99]. Therefore susceptibility or VT should be based on repeat isolation as performed in Kenya in 1985, detecting RVFV in 19 pools across 3 years [64].…”

Section: Detection Methodsmentioning

confidence: 99%

Rift Valley fever virus: strategies for maintenance, survival and vertical transmission in mosquitoes

Lumley

Horton

Hernandez-Triana

et al. 2017

Journal of General Virology

101

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Rift Valley fever virus (RVFV) is a mosquito-borne arbovirus causing severe disease in humans and ruminants. Spread of RVFV out of Africa has raised concerns that it could emerge in Europe or the USA. Virus persistence is dependent on successful infection of, replication in, and transmission to susceptible vertebrate and invertebrate hosts, modulated by virushost and vector-virus interactions. The principal accepted theory for the long-term maintenance of RVFV involves vertical transmission (VT) of virus to mosquito progeny, with the virus surviving long inter-epizootic periods within the egg. This VT hypothesis, however, is yet to be comprehensively proven. Here, evidence for and against the VT of RVFV is reviewed along with the identification of factors limiting its detection in natural and experimental data. The observations of VT for other arboviruses in the genera Alphavirus, Flavivirus and Orthobunyavirus are discussed within the context of RVFV. The review concludes that VT of RVFV is likely but that current data are insufficient to irrefutably prove this hypothesis.

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Section: Detection Methodsmentioning

confidence: 99%

Rift Valley fever virus: strategies for maintenance, survival and vertical transmission in mosquitoes

Lumley

Horton

Hernandez-Triana

et al. 2017

Journal of General Virology

101

View full text Add to dashboard Cite

show abstract

“…Although Bti products have been used only sporadically in vector control applications, they were still effective for controlling Cx. pipiens in all tested areas; however, some strains showed 2-3-fold resistance to Bti, which was expected, since the toxicity of biological larvicides can vary among laboratories [8][9][10][11][12][13][14][15][16][17] and strains. All populations showed high sensitivity to Bti, but this result should be treated with caution.…”

Section: Discussionmentioning

confidence: 83%

Insecticide resistance of Culex pipiens (Diptera: Culicidae) in Turkey

2009

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“…aegypti has also demonstrated infection and transmission rates of the non-structural NSs protein deletion virus similar to wild type virus while dissemination rates were significantly reduced (Crabtree et al, 2012). Culex pipiens has been incriminated as the main RVF vector in Egypt (Meegan et al, 1980). Moreover, records have shown that populations of Cx.…”

Section: Introductionmentioning

confidence: 99%

Comparison of sampling techniques for Rift Valley Fever virus potential vectors, Aedes aegypti and Culex pipiens complex, in Ngorongoro District in northern Tanzania

Mweya

Kimera

Karimuribo

et al. 2013

Tanzania J Hlth Res

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Abstract:We investigated mosquito sampling techniques with two types of traps and attractants at different time for trapping potential vectors for Rift Valley Fever virus. The study was conducted in six villages in Ngorongoro district in Tanzania from September to October 2012. A total of 1814 mosquitoes were collected, of which 738 were collected by CDC light traps and 1076 by Mosquito Magnet trapping technique. Of the collected mosquitoes, 12.46% (N= 226) were Aedes aegypti and 87.54% (N= 1588) were Culex pipiens complex. More mosquitoes were collected outdoors using Mosquito Magnets baited with octenol attractant, 36.38% (N=660) followed by indoor trapping using CDC light traps without attractant, 29.60% (N=537). Most of Ae. aegypti mosquitoes were collected outdoor using Mosquito Magnets, 95% (N=214) whereas Cx. pipiens complex were trapped both indoor using CDC light traps without attractant and outdoors using both CDC light traps baited with carbon dioxide (CO 2 ) sachets and Mosquito Magnets. Analysis on the differences in abundance of mosquitoes trapped by different techniques using Generalized Linear Models was statistically significance at pvalue < 0.05 for both species. Three hours mosquito collections show differing patterns in activity, most Ae. aegypti species were collected primarily during the first and last quarters of the day. Cx pipiens complex was active throughout the night, early evening and early morning then decreased markedly during the day time. The results presented in this paper emphasize the possibility of using Mosquito Magnets in order to efficiently capture these potential RVF vectors. _________________________________________________________________________________

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Experimental Transmission and Field Isolation Studies Implicating Culex Pipiens as a Vector of Rift Valley Fever Virus in Egypt

Cited by 131 publications

References 0 publications

Rift Valley fever virus: strategies for maintenance, survival and vertical transmission in mosquitoes

Rift Valley fever virus: strategies for maintenance, survival and vertical transmission in mosquitoes

Insecticide resistance of Culex pipiens (Diptera: Culicidae) in Turkey

Comparison of sampling techniques for Rift Valley Fever virus potential vectors, Aedes aegypti and Culex pipiens complex, in Ngorongoro District in northern Tanzania

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