Illness-Causing Microorganism; the Plague Was One

This page is the CodyCross answer for the clue below from Performing Arts, Group 887, Puzzle 4 (Kwame Kwei Armah).

Question is: Illness-Causing Microorganism; the Plague Was One

and the answer is: BACTERIA

Word Meaning:

BACTERIA — plural of bacterium

Definitions from Wiktionary.