For those in the US, just to let you know COVID antigen tests for use at home are commercially available. In the UK they are available for free. Now that it is known that even vaccinated people can carry and transmit virus, and cases and hospitalizations are rising again, I bought a bunch, thinking they could be used for visitors to my mother, other guests, caregivers, and us. I haven’t decided exactly when or how often to use them, but they are nice to have for peace of mind. They are around $20-24 for a kit of 2 tests. I have tried the QuickVue and the BinaxNow, and I like the Binax, which is a little more user-friendly. You can order them online (Walmart, CVS, Amazon etc).
The tests are not as good as PCR—not as sensitive for detecting infection, and there may be false positives. So if there is high suspicion for COVID and the test is negative, it should be repeated or followed up with PCR,and a positive test should be confirmed by PCR. But they are convenient. A test takes 15-20 minutes to do. It uses a nasal swab but doesn’t need to go deep.