42: She mentioned this before (a year or two ago). I thought it was silly and irrelevant then and I still think so now. It’s not Treif, it’s not Eiver Min Hachai, it’s nothing.
The only qualification I’ve seen for stepping on nails is if it the place where they first landed when they were cut (it’s a problem) as opposed to if it’s been moved (it’s no longer a problem). I think the Gemara explicitly mentions this distinction. I don’t recall seeing anywhere that differentiates between bitten and cut, for whatever that’s worth.