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At least 50% of the population of both the UK and Sweden will be shown to have already had the disease when mass antibody testing becomes available
There was a study done in Austria that does not support that so far.
https://www.theguardian.com/world/2020/apr/10/less-than-1-of-austria-infected-with-coronavirus-new-study-shows -
Interesting, although worth remembering that 0.1% of the UK population is ~67,000, so we're somewhere around 1/3 to 1/2 of the way there (depending on the death toll in care homes and everywhere else outside hospital).
Isolating the elderly/frail/vulnerable, and maintaining this until there is some other way of protecting them is still an immense problem.
Professor Johan Giesecke, one of the world’s most senior epidemiologists, advisor to the Swedish Government, the first Chief Scientist of the European Centre for Disease Prevention and Control, and an advisor to the director general of the WHO, lays out why he thinks:
https://www.youtube.com/watch?v=bfN2JWifLCY