Fig. 2.

Pathogen word stems display differing levels of news coverage over time. Klebsiella, MRSA, and CRE became associated with the term “superbug” since the term rose to popularity in the 1990s. Fold-difference from the expectation of independence is shown for whether (i.e., “Yes” or “No”) each word stem (pathogen) was used in the same articles as the term “superbug”. Red-shaded boxes represent cases where “superbug” is mentioned with another word stem more frequently than expected and blue-shaded boxes less frequently