To help clear up the disagreement: the difference I had in mind is that things like peanut butter and PEG cannot adapt to escape the immune response. Viruses an

To help clear up the disagreement: the difference I had in mind is that things like peanut butter and PEG cannot adapt to escape the immune response. Viruses and bacteria can. Antibodies against them can be detected after an infection, but they might not be effective at all.