My BIL (lives with Dsis and children) tested covid positive today after feeling flulike yesterday when he came home from work. He had the vaccine 17 days ago, but is coughing today too. Sis had the vaccine 11 days ago. So far she and kids are fine. BIL looked ok yesterday and not ill. His flow test was neg, but the test he did last night at the centre was positive today.
I briefly saw BIL when he came home from work as I was visiting Dsis. I was there in his company about 5 minutes. Said hello and left. DSis and I are in a family bubble.
Do I have to isolate as I only saw him briefly at 2 m anyway?