The only way for the Democratic party to regain and retain the trust of its own members is for Tom Perez to resign immediately, the DNC to take full responsibility for this mess, and for the American people to see a realignment of the process with fairness and integrity.
The moment anyone questions any of the vaccines on the schedule or those to come, they are labelled an antivaxxer. Sorry. Currently there are provax (get every single shot ever created without question) and antivax (I didn't get the flu shot)