Pest

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late 15th century (denoting the bubonic plague): from French peste or Latin pestis ‘plague’.

wiktionary

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From Middle French peste (whence French peste), ultimately from Latin pestis.

etymonline

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pest (n.)

1550s (in imprecations, "a pest upon ____," etc.), "plague, pestilence, epidemic disease," from French peste (1530s), from Latin pestis "deadly contagious disease; a curse, bane," a word of uncertain origin. Meaning "any noxious, destructive, or troublesome person or thing" is attested by c. 1600. Pest-house "hospital for persons suffering from infectious diseases" is from 1610s.