scholarly journals A first estimation of Culicoides imicola and Culicoides obsoletus/Culicoides scoticus seasonality and abundance in Europe

2017 ◽  
Vol 14 (2) ◽  
Author(s):  
V Versteirt ◽  
T Balenghien ◽  
W Tack ◽  
W Wint
Keyword(s):  
Culicoides Obsoletus ◽  
Culicoides Imicola

scholarly journals Vector Competence of Italian Populations of Culicoides for Some Bluetongue Virus Strains Responsible for Recent Northern African and European Outbreaks

Viruses ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 941 ◽  
Author(s):  
Valentina Federici ◽  
Maria Goffredo ◽  
Giuseppe Mancini ◽  
Michela Quaglia ◽  
Adriana Santilli ◽  
...  
Keyword(s):  
Bluetongue Virus ◽  
Vector Competence ◽  
Oral Infection ◽  
Balearic Islands ◽  
Rt Pcr ◽  
Vector Species ◽  
Vaccination Programs ◽  
Culicoides Obsoletus ◽  
Culicoides Imicola ◽  
Virus Strains

The distribution of Bluetongue virus (BTV) in Europe can be represented by two distinct and interconnected epidemiological systems (episystems), each characterized by different ecological characteristics and vector species. This study investigated the vector competence of Italian populations of Culicoides imicola and Culicoides obsoletus/scoticus to some representative BTV strains after artificial oral infection. The BTV strains were selected according to their ability to spread to one or both episystems and included BTV-4 ITA, responsible of the recent Italian and French BTV-4 outbreaks; the BTV-2 strain which caused the first BTV incursion in Italy, Corsica, and Balearic Islands; BTV-4 MOR, responsible for the epidemic in Morocco; and BTV-8, the strain which spread through Europe between 2006 and 2008. Blood-soaked cotton pledgets and Hemotek membrane feeder using Parafilm® membrane were used to artificially feed midges. For each population/strain, recovery rates (positive/tested heads) were evaluated using serogroup- and serotype-specific RT-PCR. The trial demonstrated that, except for the Abruzzo population of C. obsoletus/C. scoticus, which was refractory to BTV-4 MOR infection, all the investigated Culicoides populations are susceptible to the selected BTV strains and that, if prompt vaccination programs and restriction measures had not been implemented, BTV-2 and BTV-4 MOR could have spread all over Europe.

Sensitivity of Culicoides obsoletus (Meigen) (Diptera: Ceratopogonidae) to deltamethrin determined by an adapted WHO standard susceptibility test

Parasitology ◽  
2013 ◽  
Vol 141 (4) ◽  
pp. 542-546 ◽  
Author(s):  
R. DEL RÍO ◽  
R. VENAIL ◽  
C. CALVETE ◽  
C. BARCELÓ ◽  
T. BALDET ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
World Health Organization ◽  
Bluetongue Virus ◽  
Susceptibility Test ◽  
World Health ◽  
Biting Midges ◽  
Culicoides Obsoletus ◽  
Culicoides Imicola ◽  
Health Organization ◽  
Who Susceptibility Test

SUMMARYBluetongue is a disease of major economic concern in Europe. Its causative agent, bluetongue virus (BTV), is transmitted by several Culicoides species (mainly Culicoides imicola and Culicoides obsoletus in Europe). The application of insecticides on animals may reduce transmission of BTV, however, no formulation is currently licensed specifically against Culicoides midges. The present study assesses the susceptibility of C. obsoletus to deltamethrin using an adapted World Health Organization (WHO) susceptibility test. Midges were exposed to different dosages of deltamethrin for 1 h, and mortality after 1 h and 24 h was recorded. Results indicated that deltamethrin is highly toxic to C. obsoletus since a dose of 1·33×10−4% was enough to kill 50% of the population (LD50) in 24 h. The deltamethrin concentration needed to kill 90% of the population (LD90) was 5·55×10−4%. The results obtained in the present work could help to create a system that can be used to assess insecticide resistance and susceptibility of Culicoides biting midges.

scholarly journals Predicting the spatio-temporal distribution of Culicoides imicola in Sardinia using a discrete-time population model

2012 ◽  
Vol 5 (1) ◽  
Author(s):  
Thibaud Rigot ◽  
Annamaria Conte ◽  
Maria Goffredo ◽  
Els Ducheyne ◽  
Guy Hendrickx ◽  
...  
Keyword(s):  
Discrete Time ◽  
Population Model ◽  
Temporal Distribution ◽  
Culicoides Imicola ◽  
Spatio Temporal

Predicting spatio-temporal Culicoides imicola distributions in Spain based on environmental habitat characteristics and species dispersal

2014 ◽  
Vol 22 ◽  
pp. 69-80 ◽  
Author(s):  
J. Peters ◽  
W. Waegeman ◽  
J. Van doninck ◽  
E. Ducheyne ◽  
C. Calvete ◽  
...  
Keyword(s):  
Habitat Characteristics ◽  
Species Dispersal ◽  
Culicoides Imicola ◽  
Spatio Temporal

Expansion of Culicoides imicola, the main bluetongue virus vector in Europe, into Catalonia, Spain

2005 ◽  
Vol 156 (13) ◽  
pp. 415-417 ◽  
Author(s):  
V. Sarto i Monteys ◽  
D. Ventura ◽  
N. Pages ◽  
C. Aranda ◽  
R. Escosa
Keyword(s):  
Bluetongue Virus ◽  
Virus Vector ◽  
Culicoides Imicola

Culicoides imicola (Biting Midge)

2021 ◽  
Author(s):  
Josué Martínez-de la Puente ◽  
Bruno Mathieu ◽  
Simon Carpenter ◽  
Thierry Baldet
Keyword(s):  
Biting Midge ◽  
Culicoides Imicola

Variations in the mitochondrial cytochrome c oxidase subunit I gene indicate northward expanding populations of Culicoides imicola in Spain

2009 ◽  
Vol 99 (6) ◽  
pp. 583-591 ◽  
Author(s):  
J.H. Calvo ◽  
C. Calvete ◽  
A. Martinez-Royo ◽  
R. Estrada ◽  
M.A. Miranda ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Mediterranean Basin ◽  
Population Expansion ◽  
Spanish Population ◽  
Mitochondrial Cytochrome ◽  
Oxidase Subunit ◽  
Culicoides Imicola ◽  
Median Networks ◽  
The Mediterranean Basin

AbstractCulicoides imicola is the main vector for bluetongue (BT) and African horse sickness (AHS) viruses in the Mediterranean basin and in southern Europe. In this study, we analysed partial mitochondrial cytochrome c oxidase subunit I (COI) gene to characterize and confirm population expansion of Culicoides imicola across Spain. The data were analysed at two hierarchical levels to test the relationship between C. imicola haplotypes in Spain (n=215 from 58 different locations) and worldwide (n=277). We found nineteen different haplotypes within the Spanish population, including 11 new haplotypes. No matrilineal subdivision was found within the Spanish population, while western and eastern Mediterranean C. imicola populations were very structured. These findings were further supported by median networks and mismatch haplotype distributions. Median networks demonstrated that the haplotypes we observed in the western Mediterranean region were closely related with one another, creating a clear star-like phylogeny separated only by a single mutation from eastern haplotypes. The two, genetically distinct, sources of C. imicola in the Mediterranean basin, thus, were confirmed. This type of star-like population structure centred around the most frequent haplotype is best explained by rapid expansion. Furthermore, the proposed northern expansion was also supported by the statistically negative Tajima's D and Fu's Fs values, as well as predicted mismatch distributions of sudden and spatially expanding populations. Our results thus indicated that C. imicola population expansion was a rapid and recent phenomenon.

scholarly journals Allergen-Specific Cytokine Polarization Protects Shetland Ponies against Culicoides obsoletus-Induced Insect Bite Hypersensitivity

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0122090 ◽  
Author(s):  
Chantal Meulenbroeks ◽  
Jaco J. van der Lugt ◽  
Nathalie M. A. van der Meide ◽  
Ton Willemse ◽  
Victor P. M. G. Rutten ◽  
...  
Keyword(s):  
Culicoides Obsoletus ◽  
Insect Bite Hypersensitivity
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