I was under the impression that adenovirus vaccines have only been been approved in the past year or two - a few for Ebola and the new ones for Covid. Are there others that have been around before that?

It doesn't seem like it really matters if adenovirus vector vaccines is an "old idea" - after all, the idea of using MRNA has also been around for a long time. But if we've only started actually using them recently, how different is our knowledge of long-term effects?