BTV viral proteins in tissue sections of different sheep lymph nodes at different time points post infection (pi) with BTV-2. A1/A2: BTV protein VP7 (ORAB36- green) in the lumen of a small blood vessel in the right prescapular lymph node (PLN) at 3 days post infection (dpi). Scale bar: 80 μm. B and C: Examples of the morphology and distribution of leukocytes positive for BTV proteins VP7 (ORAB36-green) and NS2 (ORAB53-red) in the PLN at 8 dpi. Scale bars: B: 8 μm C: 20 μm. D1/D2: BTV proteins NS2 (ORAB53-red) and VP7 (ORAB36-green) in the endothelium of a capillary in the mandibular lymph node at 8 dpi. Scale bar: 8 μm.