I don't think it's really established yet whether the vaccinated can be carriers. If they can't, that discussion is worth having, but if they can't, we'll need to have vaccinations well underway before there'll be any real relief from restrictions.
And then there's the fears around the vaccine's efficacy against mutations. I read that the variant detected in South Africa has a lot of mutations relating to the spike protein, so they're a bit worried about that one. Hopefully that's already old news and it's not a problem; I try not to read as much about this as I used, because it's just stressful. But yeah, we need time to figure out what the vaccinations really buy us. The degree to which this was left run riot worldwide is to blame, as it happens. The more infected people there are, the more likely a mutation is to arise. If we'd all pursued a zero-covid strategy, there wouldn't be a fraction of the reservations about the effectiveness of the vaccinations. But no, we had to have gastropubs open in July.
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