Dec 17 (Reuters): The (Imperial College London) study involved AstraZeneca and Pfizer vaccines.

Depending on the estimates used for vaccine effectiveness against symptomatic infection from the Delta variant, this translates into vaccine effectiveness of between 0% and 20% after two doses.

Depending on the estimates? I'm guessing it's closer to 0% than 20. Either way it means
there's no scientific basis whatsoever for vax passports - or if there is, then you don't get one unless you've been boosted, which will be valid for a few months, then you'll need to get boosted again, and so on - until Covid goes away or you croak it from heart problems.

If the unvaxxed are so dangerous that they need to be locked out of society then the same must apply to double-vaxxed. The fact that it doesn't, proves vaccine mandates are purely an exercise in power enforcement and bastardry.