Vaccination status is a bit like painting a bridge. Its never 100%.
They're playing a semantic game "fully vaccinated" is an unachievable goal for the population. Public health policy has been an absolute failure. Its time for the grown ups to takeover from hyperventilating pandemjc modellers, open up, and let everyone get exposed to what is just a cold virus.
I doubt Zack Kirkup would have done any better, in fact we'd be lockdown and sittjng in the dark because he'd have shutdown Collie by now.
