RE: Lateral Flow Tests, agreed by PHE as 99.7% accurate, show 80% fewer cases in Liverpool17 Nov 2020 13:08
Comparing PCR and Antigen tests is not an exact science.
If this helps antigen testing — named for the viral proteins, or antigens, that the test detects — is unlike lab-based, molecular PCR tests, which detect snippets of the virus’s genetic material, antigen tests are less sensitive because they can only detect samples with a higher viral load.
This is the crux of the Avacta test, it will pick up a higher viral load ,this is key to identifying people who are the most infectious.
This is where the needle in the hay stack comes into play, its quite possible Avacta have been struggling to achieve with saliva on its own, they have in turn lost 2 months trying to perfect and eventually realising they couldn’t technically produce this test they adapted the Swob around the gums and possibly self administered into the bottom section of the nose.
We will of course soon find out but I suspect the test works and they are just finalising TT.