--of stress, including that associated with flu, colds, or other viral illnesses, exacerbating neuropathy symptoms.

It's not certain whether this comes from just having one more thing to deal with, or whether some sort of immune mechanism is at work. Certainly, those whose neuropathy has a suspected or proven autoimmune component would be more vulnerable, as infection changes your immune status.

I would still consult with your physician(s) about upping one's meds if neuropathy symptoms got worse with an illness, in much the same way one would consult if one's symptoms got worse in general. I suspect that many physician's responses would be just as speculative as mine here, but at least that give you a little butt-coverage.