History of the Peloponnesian War

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.

On the city of Athens it fell suddenly, and first attacked the men in the Piraeus; so that it was even reported by them that the Peloponnesians had thrown poison into the cisterns; for as yet there were no fountains there. Afterwards it reached the upper city also; and then they died much more generally. Now let every one, whether physician or unprofessional man, speak on the subject according to his views;

from what source it was likely to have arisen, and the causes which he thinks were sufficient to have produced so great a change [from health to universal sickness]. I, however, shall only describe what was its character; and explain those symptoms by reference to which one might best be enabled to recognise it through this previous acquaintance, if it should ever break out again; for I was both attacked by it myself, and had personal observation of others who were suffering with it.