The Roman History · Amm. 19.4.1

But in the city, where the number of the corpses which lay scattered over the streets was too great for any one to perform the funeral rites over them, a pestilence was soon added to the other calamities of the citizens; the carcases becoming full of worms and corruption, from the evaporation caused by the heat, and the various diseases of the people; and here I will briefly explain whence diseases of this kind arise.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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