In comparison, peak average titers for RSV BT2a, BT3a and BT4a after infection were 4.20, 3.80 and 3.25 log10 TCID50/ml at MOI = 0.1, respectively, and 5.00, 4.75 and 3.45 log10 TCID50/ml at MOI = 5, respectively. This evidence concerns the gene BDNF-AS and infection.