A very healthy (& cautious) octogenarian, I had my second booster recently. I also traveled a lot, in the U.S. and Europe. I am invariably the only, or almost only person on the plane wearing a mask. We cannot know about much of the viruses that I think are probably hear to stay, but it costs little to take precautions. I've had neither covid nor a noticeable cold in the past few years. Thanks for this.