I saved a life with a +PCR for the CTX-M gene in an unexpected ESBL-E bacteremia.
Identifies blood cultures in an hour as opposed to 24-48 with standard methods.
Amazingly useful tech.
It sounds a bit like the approach used to receive weak radio signals from deep space and other planets in the solar system. However, as described here, it seems that a PCR test would only be useful if the patient has a pre-COVID baseline (and even then subject to strict limits on number of cycles).
Misuse of what, under the right circumstances, could be a useful technology.