The susceptibility of Culicoides imicola and other South African livestock-associated Culicoides species to infection with bluetongue virus serotype 8

Venter, Gert J.; Wright, Isabel M.; Río, R. Del; Lucientes, Javier; Miranda, Miguel Ángel

doi:10.1111/j.1365-2915.2010.00931.x

Cited by 13 publications

(19 citation statements)

References 26 publications

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“…Although Culicoides imicola Kieffer 1913, an abundant proven orbivirus vector in South Africa, is attracted to and can be collected in extremely large numbers near livestock (Meiswinkel et al ., ), nothing is known about additional factors that would attract this and other Afrotropical Culicoides species to livestock. The addition of a mixture of octenol and methylphenol to the Onderstepoort 220‐V trap has been shown not to influence species richness, numbers collected, sex ratios or age‐grading results (Venter et al ., ).…”

Section: Culicoides Midges Collected Using Centers For Disease Contromentioning

confidence: 97%

“…Although trap catches using CO 2 as bait are reported to reflect biting populations of Culicoides sonorensis Wirth and Jones, 1957 in the U.S.A. (Mullens & Gerry, ), these and other major vector Culicoides species appear to utilize more complex attraction cues (Mullens & Gerry, ; Bishop et al ., ; Harrup et al ., ). Previous studies have indicated that octenol did not increase the number of South African Culicoides collected with the 220‐V Onderstepoort trap (Venter et al ., ). It remains to be determined if the simultaneous use of CO 2 and octenol might have a synergic effect on catch numbers of C. imicola , as is the case for some North American species (Cilek & Kline, ).…”

Section: Culicoides Midges Collected Using Centers For Disease Contromentioning

confidence: 97%

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Influence of carbon dioxide on numbers ofCulicoidesmidges collected with suction light traps in South Africa

Venter

Boikanyo

Majatladi

et al. 2015

Medical Vet Entomology

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To implement risk management against diseases transmitted by species of Culicoides Latreille, 1809 (Diptera: Ceratopogonidae), it is essential to identify all potential vectors. Light traps are the most commonly used tool for the collection of Culicoides midges. Given the indiscriminate artificial attraction of light, traps will collect all night-flying insects rather than only livestock-associated Culicoides midges. Factors that may increase the efficacy of traps, especially for livestock-associated Culicoides midges, require investigation. In the present study, results obtained with Centers for Disease Control (CDC) and Onderstepoort light traps baited with carbon dioxide (CO2 ) were compared with those of unbaited controls. Comparisons were made using two replicates of a 4 × 4 randomized Latin square design. With both trap types, the mean numbers of Culicoides midges collected in 16 baited traps were higher than those caught in 16 unbaited traps. Although exceptionally low numbers were collected with the CDC traps, the increases in the numbers and frequency of collection of Culicoides imicola Kieffer, 1913 were more pronounced in the CDC traps compared with the Onderstepoort traps. These results indicate that the addition of CO2 may increase the efficiency of these traps for the collection of C. imicola and other livestock-associated Culicoides species.

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Section: Culicoides Midges Collected Using Centers For Disease Contromentioning

confidence: 97%

Section: Culicoides Midges Collected Using Centers For Disease Contromentioning

confidence: 97%

Influence of carbon dioxide on numbers ofCulicoidesmidges collected with suction light traps in South Africa

Venter

Boikanyo

Majatladi

et al. 2015

Medical Vet Entomology

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“…Outbreaks of bluetongue (BT) in northern Europe have indicated that the virus can effectively be transmitted by several species in this genus Carpenter et al, 2009). A similar multi-vector potential has also been demonstrated for BTV, AHSV and EHDV in South Africa (Paweska et al, 2003;2005;Venter et al, 2011b).…”

Section: Introductionmentioning

confidence: 93%

“…In the absence of laboratory colonies Onderstepoort light traps are also used to collect live Culicoides midges for biological studies requiring live specimens (Paweska et al, 2003;2005;Veronesi et al, 2009;Venter et al, 2011b). Numerous factors that may contribute to variability in the numbers of specimens collected render the interpretation and comparison of data between different trapping events challenging.…”

Section: Introductionmentioning

confidence: 99%

The attraction range of the Onderstepoort 220V light trap for Culicoides biting midges as determined under South African field conditions

Venter

Majatladi

Labuschagne

et al. 2012

Veterinary Parasitology

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Despite some limitations suction light traps are the primary tool used for the collection of Culicoides species (Diptera: Ceratopogonidae). The range of attraction of the Onderstepoort light trap is not known but an insight into the range of a trap will determine where the trap must be positioned relative to the hosts present, possible breeding sites and environmental structures in the trapping vicinity. It will therefore contribute to a more meaningful interpretation and comparison of results between trapping events. In the present study the number of Culicoides midges collected in a single trap was compared to those of traps made with an additional trap respectively 1 m, 4 m and 8.5 m away from the first. Treatments between sites were rotated in three replicates of a 4x4 Latin square design. While interactions were found in traps 4 m apart no statistically significant interactions were found when they were 8.5 m apart. The range of attraction, indicated by the interaction between two traps, will be between 2 m and 4 m. In interpreting light trap results the limitations of this collection method needs to be taken into consideration.2

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“…imicola have been undertaken and results remained limited (Biteau‐Coroller, ), due to the difficulties in feeding and maintenance in the laboratory and limited number of specimens captured on the field. However, an extensive work have been conducted with this species in South Africa where its role for transmission of BTV, African horse sickness virus (AHSV) and epizootic haemorrhagic disease virus (EHDV) has been widely demonstrated by vector competence studies (Venter et al., , , ; Del Rio et al., ).…”

Section: Assessmentmentioning

confidence: 99%

Bluetongue: control, surveillance and safe movement of animals

Nielsen¹

2017

EFS2

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The performance of different bluetongue control measures related to both vaccination and protection from bluetongue virus (BTV) vectors was assessed. By means of a mathematical model, it was concluded that when vaccination is applied on 95% of animals even for 3 years, bluetongue cannot be eradicated and is able to re-emerge. Only after 5 years of vaccination, the infection may be close to the eradication levels. In the absence of vaccination, the disease can persist for several years, reaching an endemic condition with low level of prevalence of infection. Among the mechanisms for bluetongue persistence, the persistence in the wildlife, the transplacental transmission in the host, the duration of viraemia and the possible vertical transmission in vectors were assessed. The criteria of the current surveillance scheme in place in the EU for demonstration of the virus absence need revision, because it was highlighted that under the current surveillance policy bluetongue circulation might occur undetected. For the safe movement of animals, newborn ruminants from vaccinated mothers with neutralising antibodies can be considered protected against infection, although a protective titre threshold cannot be identified. The presence of colostral antibodies interferes with the vaccine immunisation in the newborn for more than 3 months after birth, whereas the minimum time after vaccination of animal to be considered immune can be up to 48 days. The knowledge about vectors ecology, mechanisms of over-wintering and criteria for the seasonally vector-free period was updated. Some Culicoides species are active throughout the year and an absolute vector-free period may not exist at least in some areas in Europe. To date, there is no evidence that the use of insecticides and repellents reduce the transmission of BTV in the field, although this may reduce host/vector contact. By only using pour-on insecticides, protection of animals is lower than the one provided by vector-proof establishments.

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The susceptibility of Culicoides imicola and other South African livestock-associated Culicoides species to infection with bluetongue virus serotype 8

Cited by 13 publications

References 26 publications

Influence of carbon dioxide on numbers ofCulicoidesmidges collected with suction light traps in South Africa

Influence of carbon dioxide on numbers ofCulicoidesmidges collected with suction light traps in South Africa

The attraction range of the Onderstepoort 220V light trap for Culicoides biting midges as determined under South African field conditions

Bluetongue: control, surveillance and safe movement of animals

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