According to what I heard from the people who remember these things, I think I was able to locate where you could buy live lice in Florence to swallow to cure your jaundice. A typical holobiont thing to do.
The old lady who sold these lice lived - I believe - in the house with the small arched door of this street called "Via Camaldoli." She was called "La Pidocchina," that is, "the little lady louse."
I didn't try to ring the bell to ask if someone in there still sold live lice. But, who knows?