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How do you know you didn't need a test without having a test ?
'better safe than sorry' is probably the rationale.More the point that, by the time you get the negative result a few days later, you could be positive, contagious and either pre-symptomatic or asymptomatic.
But, yes, 'better safe than sorry' is how we use our ONS results to decide when we go to visit elderly relatives. If we've made the decision to go and see them then going shortly after getting the negative result is the 'least unsafe' time to do so, and we've still got to be careful about our movements/interactions in the week between being tested and seeing the relatives.
(Note I use 'least unsafe' rather than 'safest'. There are much safer mitigations such as just doing it on Zoom or not going at all.)
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Greenbank
How do you know you didn't need a test without having a test ?
'better safe than sorry' is probably the rationale.