The only difference between the 4/1/21 slide set and the 2/8/21 slide set is that the latter shows the phase-2 pediatric RSV trial (RSVPEDSs) started in March, 2021.
The only differences between the 5/6/21 (latest) slide set and the 3/31/21 (previous version) slide set are the financial info from FY2Q21 and the inclusion of the phase-1b data for EDP-514 in nuke-suppressed HBV patients.