Unchanged Schmallenberg virus seroprevalence in the Belgian sheep population after the vector season of 2014 and 2015 despite evidence of virus circulation, Sohier, Charlotte, Michiels Rodolphe, Kapps Elena, Van Mael Eva, Quinet Christian, Cay Ann Brigitte, and De Regge Nick , Research in Veterinary Science, Jan-10-2017, Volume 114, (2017)