Unvaccinated youth is really interesting because they have such a clear intra age group network of contacts that they could still work like a conductor sending

Unvaccinated youth is really interesting because they have such a clear intra age group network of contacts that they could still work like a conductor sending the virus "everywhere" even if they were the only ones susceptible. Even if the rest was 99% vaccinated, the remaining 1% of the rest would likely get it from the "conductor age group", at least unless they have so little contact with the "conductor" that they remain lucky until natural immunisation has happened within the "conductor". But we'll be safe from scenarios like overwhelmed burial logistics in population centers so there won't be much pressure for action. Which personally I find a bit unfortunate, because with vaccinating going forward an additional month more of countermeasures has a well-defined benefit whereas earlier in the pandemic the benefit was a bit murky because countermeasures might have been just a delay of eventually inevitable infections. Cost/benefit is much better now, but cost of inaction is ceasing to be sensational failure, it's getting subtle now. Lucky I think are countries like Portugal that have tackled a massive wave just before vaccination ramp-up, I believe that they can just watch as the infection rates recovering from hard suppression slowly creep up before vaccination eventually takes their sting, with little risk of another wave hitting unbearable levels.