The "willingly" makes the difference there. That changes it from negligence to intentional, and those are legally distinct.
If Amazon, or another marketplace, isn't aware of the danger of a product sold by a vendor on their platform, it's not clear if Amazon, or the market provider, is responsible. Amazon is arguing that they aren't, but I don't know enough of the law to say if that is a settled question.
What if we did something to the virus so that it couldn't make us sick, but still made our bodies thing we were sick?