One form of testing that was done in China - and not elsewhere - is
serology testing. A blood test will show who has anti-bodies for the
virus, thus who has been exposed to it. It has no value as a diagnostic
test, but is a tool for epidemic control.
Let's not be silly and have a 'you've got it or you don't' view of this
infection. And getting through with a mild case might just mean having been
exposed to a small dose of the virus.
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