History of the Peloponnesian War

For neither were physicians of any avail at first, treating it as they did, in ignorance of its nature,—nay, they themselves died most of all, inasmuch as they most visited the sick,—nor any other art of man. And as to the supplications that they offered in their temples, or the divinations, and similar means, that they had recourse to, they were all unavailing; and at last they ceased from them, being overcome by the pressure of the calamity.

It is said to have first begun in the part of Aethiopia above Egypt, and then to have come down into Egypt, and Libya, and the greatest part of the king's territory.