It's the viral genome that I'm proposing we target. Specifically, we should cut it in half so it doesn't work anymore. That's is how CRISPR works in nature: for modifying the threat, not modifying oneself. It would be much simpler to make vaccines this way. It could happen fast enough to make a difference.

The only part of the human genome that would need to change for this is the one that puts the scissors (CAS-9) in place for later use. I suppose since we'd have them lying around we might later want to use them for more invasive gene therapies which do target the human genome, but that would be a separate decision for a later date.

As for the diet part... if nature is going to force our hand here one way or another, we might as well handle things on our own terms. Or maybe nature isn't going to. But that's the kind of thing a scientist would study in the wake of a pandemic if we weren't all so toxic about it. Maybe we'll be more interested in prevention after there are a few more of these and COVID starts looking like the warning shot that we ignored.