My last sentence shows that I don't think my comment is going to save us from (or even help with) this pandemic. I also chose to ask it in a thread towards the

My last sentence shows that I don't think my comment is going to save us from (or even help with) this pandemic. I also chose to ask it in a thread towards the bottom where the OP is answering not-new concerns. I think you have pattern-matched me (well, you say as much) and have read some intentions into my comment. For the record, my main intention was to get an expert to say something that would gratify my curiosity and that of other readers. I hadn't heard of it before, so I assumed it was likely impractical at the moment, but guessed that technology would eventually get there. Also, are you an expert in this field? Your sibling comment seems to be saying "yes they are working on it, no it's not practical yet except for HIV" (I presume because HIV infects white blood cells), which is at odds with your second paragraph. (Edit: Though, to be very precise, the examples from the sibling comment are about measuring infectivity and—I guess—the impact of drugs, not immune response.) It would be ironic if a non-expert gave an ignorant dismissal of a question for being ignorant.