I've just got back from 5 days away with friends, one of whom complained of a (pre-existing) cold on the second day but had tested negative by lft before arriving.
We travelled home together yesterday and today they have tested positive, I've been for a pcr today.
If it is negative does that mean only that I haven't got it yet and still could become positive or does it mean I haven't caught it from them?
I suspect the former but am really hoping for the latter!