Recombinant KU 160 viruses carrying the RRV VP4s [KU-VP4(RRV)] were rescued from the 10th passage in MA104 161 cells by two plaque-to-plaque cloning steps in MA104 cells, as previously described (32). The KU-VP4(RRV) was back crossed to RT(VP4) 162 (RRV reassortant containing TUCH VP4) to obtain RRVrVP4 163 (RRV with a recombinant VP4). Therefore the viruses obtained from the plasmids pBacT7-VP4(RRV), pBacT7-VP4(RRVXbaI), and pBacT7-VP4(RRVR446G 164 ) were named RRVrVP4, RRVVP4-XbaI and RRVVP4-R446G 165 respectively.
Recombinant KU 160 viruses carrying the RRV VP4s [KU-VP4(RRV)] were rescued from the 10th passage in MA104 161 cells by two plaque-to-plaque cloning steps in MA104 cells, as previously described (32). The KU-VP4(RRV) was back crossed to RT(VP4) 162 (RRV reassortant containing TUCH VP4) to obtain RRVrVP4 163 (RRV with a recombinant VP4). Therefore the viruses obtained from the plasmids pBacT7-VP4(RRV), pBacT7-VP4(RRVXbaI), and pBacT7-VP4(RRVR446G 164 ) were named RRVrVP4, RRVVP4-XbaI and RRVVP4-R446G 165 respectively.