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The shot I had a few years ago was two-dose. I'm not aware of a single dose version then or now, but I guess there was one since you had it. Based on a brochure I was given when I had the new version in late 2021, it uses a "recombinant DNA" technology, not an mRNA technology. I became suspicious, but I can't say I've heard of any significant problems with the new version.

I became suspicion because it was mandated in late 2020, just as Covid was (as yet unknown) beginning to circulate and because suddenly I was seeing TV ads for it in moid-2021 just as bad publicity about the mRNA vaccines was coming out. To my paranoid mind, I thought they were trying to round up mRNA refuseniks with a different trap - the new shingles vaccine.