BTV viral proteins in tissue sections of sheep tonsil at different time points pi with BTV-2. A1/A2: BTV proteins VP7 (ORAB36-green) and NS2 (ORAB53- red) co-localised in a focal area of the tonsil’s epithelium at 6 dpi. Scale bar: 20 μm. B1/B2: BTV protein NS2 (ORAB53- green) in CD45+ positive cells (mAb151- red) in the epithelium of the tonsil at 4 dpi. Scale bar: 20 μm. C1/C2: BTV proteins VP7 (ORAB36- green) and NS2 (ORAB53- red) in the amygdaloid tissue of the tonsil at 6 dpi. Scale bar: 40 μm.