Despite the differing data of calves A1 and B1, and although the number of animals in the first study was low (n = 3 + 3), we concluded that BRSV-Snk infected calves tended to be more severely affected in the 7-day experimental infection model, compared to BRSV-Dk infected calves, when summarizing clinical, pathological and virological parameters (Figure 5B). The gene discussed is PLK2; the disease is infection.