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

Autor: Valentina Federici, Maria Goffredo, Giuseppe Mancini, Michela Quaglia, Adriana Santilli, Francesca Di Nicola, Matteo De Ascentis, Pierangela Cabras, Carmela Volpicelli, Claudio De Liberato, Giuseppe Satta, Giovanni Federico, Alessandra Leone, Maura Pisciella, Ottavio Portanti, Federica Pizzurro, Liana Teodori, Giovanni Savini
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Viruses, Vol 11, Iss 10, p 941 (2019)
Druh dokumentu: article
ISSN: 1999-4915
DOI: 10.3390/v11100941
Popis: 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.
Databáze: Directory of Open Access Journals
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