RE: LFD's12 Jan 2022 19:18
Have a look at the original post, I posted it before for reference and I've added it below, it does not discuss you being misled until you've bought it up. You have a valid reason to discuss it, but this isn't the thread that was started.
Thanks all for the useful discussion last night. I think I can understand the details of how their test works now .
What it does though, is leave me surprised, that the company issued the rns in December when given how the test works, it was almost inevitable that Omicron was going to, at the least, cause a drop in sensitivity. I would have expected them to wait until they had more quantitative data before saying anything.
If I had realised how the test works I would have been more wary, and not topping up with some more shares after this announcement, my thinking was that it demonstrated that the test was robust to mutations in S - it will teach me to work harder at doing my research!
It will be interesting to see how they now modify it. The antibody component (because it binds at multiple sites) amplifies the signal and also provides some some protection against test failure due to a single mutations - the problem with Omicron was there were a lot of these, with a large number being in the most antigenic region of the S protein where antibodies typically bind.
Will they try and find a replacement polyclonal antibody where more bind to conserved regions of S, will they add a N component, or have they something else in mind? It is not just a case of swapping the antibody for a single Affimer as this would reduce sensitivity (and redundancy) in the assay.