The booster will be a different vaccine to your first 2 jags (yes, it's a jag not a jab, you are Scottish after all) and so will protect you more. As already mentioned on here, the Pfizer is apparently better against this particular variant so if you've had, say, two AZ jags then going for a booster, which would probably be Pfizer, would be the safe bet. But only if you can get back in time from Roswell. [emoji16] Sent from my SM-A415F using Tapatalk