This is significant:
Fewer than one in five healthcare workers who suspected they had coronavirus actually tested positive for the disease, according to one of the first published UK studies of mass testing on NHS workers.
Scientists from Sheffield, which started testing all symptomatic healthcare workers a fortnight before much of the rest of the UK, have published research showing that 81% of staff reporting symptoms tested negative.
https://www.theguardian.com/world/live/2020/apr/10/coronavirus-uk-live-boris-johnson-still-in-hospital-as-public-urged-to-stay-home-for-easter
1) If healthcare workers aren't able to differentiate the symptoms effectively the rest of us almost certainly can't. Therefore, many of those people who had "corona virus earlier this year" very probably didn't. A few of course probably did.
2) The report discusses results from the two weeks following March 17th. That was before NHS worker testing was accelerated. Therefore, it's very possible that in recent days the increased number of tests done on NHS worker has artificially pushed down the UK's positive test percentage. That could be a worry.
Originally Posted by: Brian Gaze