If you have dead bodies, pestilence, lice, with a 90 temperature--mosquitoes, flies--then you have serious problems.
In dramatic lore their names are Death, Destruction, pestilence, and Famine.
Cats, the Times told us, are a pestilence akin to gypsy moths and kudzu.
c.1300, from Old French pestilence "plague, epidemic" (12c.) and directly from Latin pestilentia "a plague, an unwholesome atmosphere," noun of condition from pestilentem (nominative pestilens) "infected, unwholesome, noxious," from pestis "deadly disease, plague" (see pest).
pestilence pes·ti·lence (pěs'tə-ləns)
A usually fatal epidemic disease, especially bubonic plague.
An epidemic of such a disease.