This thread. And if you scroll down, there's a picture someone took of the various ways she tested and the results. https://twitter.com/DrEricDing/status/1484907053600681991

I have a friend whose hubs tested positive, she told me she'd just tested and was negative. Asked if she did the throat, too, she hadn't heard of it either. She retested and it was positive. The new strains are so quick that's they're in your throat before you know it, and barely registers in the nose now.