Study areas in Spain showing wild ruminant sampling sites by study year. A) 2003–2004; B) 2004–2005; C) 2005–2006; D) 2006–2007. A year is defined as the period July–June. Animal movement restriction areas for each year (www.mapa.es) are shown (gray areas). White dots show wild ruminant seronegative sampling sites, and black dots show level of bluetongue virus seroprevalence in wild ruminants. Numbers of sampled wild animals per sampling site are shown in parentheses.
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