Originally Posted by
Mike T
Lots think they have had it - even before it had escaped from China. One guesstimate I have seen is 3% in the UK. We don't know. As to the different incidences - and deaths - in different countries, it does of course depend on how many you test, and how good the test is. If the test is not close to 100% accurate, with a condition that is relatively uncommon in the community, you get far more more false positives than true positives.
As the deaths are climbing, I think it is safe to say the underlying incidence is also climbing - so however many have had it, there has not yet been enough of them for herd immunity to have any beneficial effect.