efficience

Updated: June 15, 2025

I say, then, that of such efficience was the nature of the pestilence in question in communicating itself from one to another, that, not only did it pass from man to man, but this, which is much more, it many times visibly did; to wit, a thing which had pertained to a man sick or dead of the aforesaid sickness, being touched by an animal foreign to the human species, not only infected this latter with the plague, but in a very brief space of time killed it.

Giovanni Boccaccio - The Decameron of Giovanni Boccaccio