probably 3rd since AZ one is still 2 shot vaccine. Of course it depends when you had your shot, if you only had 1 probably you'll get only the "updated" one as

probably 3rd since AZ one is still 2 shot vaccine. Of course it depends when you had your shot, if you only had 1 probably you'll get only the "updated" one as 2nd But this discussion is ongoing for all vaccines in order to tackle the new/future strains, not only for the AZ one