I suspect the plan will be "you've been a close contact of X who has CV- you need to isolate 7 days - we'll test you in 5 days or if you get symptoms"
This will catch enough to bring R0 down - although it can take 14 days to show symptoms, most do so within 7.
I suspect the number of symptomless cases are actually quite low: in one care home outbreak 90% of residents (about 50) 70% of staff (about 35) tested positive and all were symptomatic with no positive tests for asymptomatic residents/staff.
This may represent the virus burden from close proximity of course, compared to a more typical community case.
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