Negative & happily so

The accuracy of these seems to be a little doubtful. But if they help then good. And the smart people say they do help.
Daughter got pinged by track & trace as a contact so we've done two of these over the past week - all of us negative both times.
Makes you think though, when the ping comes in, about what might happen to you & yours next.
The worst bit of doing them, for me, is the resulting 5-10 mins of sneezing that follows.