@sirfredfredgeorge
Why haven't the vaccines been "tweaked" for Delta let alone any new variant, we were told this was going to be a feature of them? Yet we've had no tweaking and no even announcements of studies?
Good question and I've wondered this too. There are potentially big problems in doing this though. For instance, as soon as it's announced that a new vaccine update is in progress, people will want to wait for the updated vaccine, and not get jabbed with the inferior old version - leading to weeks to months of poor uptake. If the current vaccine is still pretty effective, the transition could end up having unintended adverse consequences.