There are marked differences in your immune system after a natural infection with coronavirus and after vaccination. Which is better?
It is now a serious question that has implications for whether children should ever be vaccinated. And whether we use the virus or booster shots to top up immunity in adults. Both have become contentious issues.
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"We could be digging ourselves into a hole, for a very long time, where we think we can only keep Covid away by boosting every year," Prof Eleanor Riley, an immunologist from the University of Edinburgh, tells me.
Prof Adam Finn, a government vaccine adviser, says over-vaccinating people, when other parts of the world had none, is "a bit insane, it's not just inequitable, it's stupid".
I've spoken to experts to compare vaccine and natural infection with the virus - here's what they told me.