Median sensitivity of the bulk milk testing program in 200 dairy cattle herds in high-risk areas (BMT_TS-CSe), of clinical surveillance in cattle (CLIN-CSe Cattle) and sheep (CLIN-CSe Sheep) and of the median overall surveillance system sensitivity (SSe) of detecting BTV-8 cases (sensitivity, %) in Switzerland over a period of one year. The sensitivity calculations were done per month and the numbers refer to the respective month (1 = January, 2 = February, 3 = March etc.).