In the house are me, DD11 and DD13.
Me: mild gastric symptoms for two days (bloating, mild diarrhoea), now feeling fine (day 3). No vomiting, fever, cough or change to smell/taste.
DD11: has complained of 'tummy ache' and headache, both mild, for two days (started day after mine). No vomiting or diarrhoea. No fever, cough or change to smell/taste.
DD13: feels absolutely fine.
None of these meet the testing criteria, but would you think it sounds enough like coronavirus to test?
The alternative explanation is both DD11 and I ate something 2 days ago that DD13 did not.