Around 10-20% of infections lead to long Covid, which you really don't want. And the more cases of Covid, the more opportunity for the virus to mutate. There seems to be something very worrying happening in Brazil, where it is completely out of control - since February young people are starting to die in much greater numbers than before, implying a variant that is 3+ times more deadly to 20-somethings. And don't forget the young have no automatic right to be safe from these things - in
1918 flu deaths peaked at the age of 28.
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It's actually about much more than that, but even if you take that narrow definition - we can't afford to go back to lockdowns every winter when a new variant emerges that breaks the current vaccine. The only way to protect the economy is to follow the example of Japan, South Korea etc and take tough decisions which get us rid of it. We're still at 10x the infection rate of last summer - and that infection rate was still not low enough to prevent the explosion of cases in the winter.
Look I completely understand why people think we can relax a bit now, with the vaccination programme going well and if they have personally been vaccinated. But in fact this is a really dangerous time, it's not the time to get sloppy. If you want to generate a variant that breaks the vaccine, then you need a big population of virus (ie lots of unvaccinated people) with the opportunity to meet lots of vaccinated people, particularly people who have only had one ***.
Does that sound anything like where we are now? In fact, I wonder if we've not already created a vaccine-breaking variant in Yorkshire - something doesn't feel quite right about the way cases are surging in places like Wetherby and Sheffield. But certainly the whole world should be worried about what's going on in Brazil, and Manaus in particular. There's estimates that Manaus was up to around 75% infected by October, which should have been enough for "herd immunity" - but all that happened was they had so much virus circulating that it created variants that broke the immunity given by natural infection and now Brazil seems to be facing a real disaster.
Nobody is safe until everyone is safe.