BRDT and infection: The results indicated that the BoMac cells infected with T9.55 had significantly higher relative cell viability than those infected with either HB0801 or CT9.55 at 24 h (p < 0.01) and 36 h (p < 0.05) post-infection, whereas no difference in relative cell viability was observed between HB0801 and CT9.55 (p > 0.05; Figure 3(a)).