BMJ: "Real concern exists that many people who are not infectious (and not likely to become infectious) will receive positive test results, and together with their contacts, will be forced to isolate unnecessarily." https://www.bmj.com/content/370/bmj.m3699

"In the context of mass surveillance, this could be a majority of those who test positive. Using PCR for population screening—even with a lower maximum Ct value cut off—is not epidemiologically sound."

"If PCR is used to identify cases through mass testing of healthy people, it will deliver positive results in individuals with previous resolved infections, new infections, and potential re-infections,

as well as false positives in people genuinely not harbouring the virus (around 0.8% of all tests performed)."