I can understand reticence, and I don't have any specific knowledge about these vaccines other than what I read in the press. They will have to apply to the fda for permission to fast track as an emergency.
We all have to read up and make our decision based on the facts we have.
This reminds me of the dilemma we had over 20 years ago with MMR vaccine and an alleged link to autism (subsequently disproven) at the time many parents were uncertain. In the end we did vaccinate our baby but it was a big dilemma.