Daft question - I thought the specificity meant it's accuracy in determining this strain of coronavirus from others?
The American FDA have a good page on it all here:
https://www.fda.gov/medical-devices/emergency-situations-medical-devices/eua-authorized-serology-test-performance
Along with an Excel sheet which does all the maths here:
https://www.fda.gov/media/137612/download
Xioni's figures are correct, but assume that hardly anyone has had it (the official rate is 0.35% of the country, but bear in mind that's just the number of confirmed cases divided by the population of the UK).
In reality it's going to be much higher than that, especially accounting for those who had it early on when testing was so limited. I would expect at least 4%, much in line with France and Spain.
EDIT: And of course, we won't know how many people have had it until we get testing... as a negative is almost certain to mean negative, we'll at least know who hasn't had it (as well as those who may not have had it, but who have given a false positive).
Edited by user
14 May 2020 16:16:41
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Reason: Not specified