Really neat possibilities..
I also read this morning that a saliva test for COVID is being more widely used (the one developed for and paid for by the NBA). They are using it at the U of Illinois for students and staff. They have repurposed the veterinary lab to process the tests. They get results in 2-3 hours and reliability is close to the PCR swab test.
This type and speed of testing is really necessary to safely open schools and businesses. It allows for almost immediate isolation of positive cases and effective contact tracing to reduce spread.