Figure 5.

Estimated proportion of naive herds at risk of BTV outbreaks ($P$). Estimations over time periods of five years and early (March–May), mid (June–August) and late (September–November) seasons mapped across Europe for 2000–2015 (spatial cell scale = 0.25° lat./long.). Colours indicate increasing proportion of risk from yellow to red (zero risk is coloured grey). It should be noted that the risk map was calibrated using serological data for BTV-8 serotype and midge capture data that did not include C. imicola (see Results and Discussion).