Covid, coronavirus, whatever you want to call it is an RNA virus, much as flu is an RNA virus. What these viruses share in common is the propensity to mutate. This is ongoing and every so often a new, viable variant emerges. Vaccination is a constant arms race as each variant is less affected by the vaccine currently in use, which is why the flu vaccine is only about 40% effective.
So now we get this:
Fully vaccinated adults can harbour virus levels as high as unvaccinated people if infected with the Delta variant, according to a sweeping analysis of UK data, which supports the idea that hitting the threshold for herd immunity is unlikely.
There is abundant evidence that Covid vaccines in the UK continue to offer significant protection against hospitalisations and death. But this new analysis shows that although being fully vaccinated means the risk of getting infected is lower, once infected by Delta a person can carry similar virus levels as unvaccinated people.
Yes? And? See also, the arms race with flu vaccines. This is why vaccinating a whole population when only a small proportion are actually seriously at risk is not only a waste of time, but potentially foolish as it risks reversing the evolutionary pressure on the more virulent strains.
There is nothing here that could not have been foreseen.
Presumably there are experts on virology who have been saying this all along. You don’t get to advise the government if you don’t give them the answers that they want.