>> just saying it is a variation of the old one, so no testing is required.”
Health> So why aren’t they doing this?
First, as I explained, it seems that manufacturers are not yet requesting it, seeing that the current vaccines are still useful. Biontech founder talked about this recently. Google it for more details.
Second, I outlines two extremes, I don’t know which one is more reasonable. If they follow a permissive one, some would immediately say “untested”!!
In my, not fully informed, opinion, there could be more careful experimentation within the ongoing vaccination: try slightly different doses, slightly different schedules, to gradually build knowledge of what works better without doing much harm.