Definition

In medical terms, how aggressively a disease can mess you up. In marketing, how quickly and devastatingly a campaign can spread (for better or worse). The measure of potency, whether it's a virus destroying cells or a brand message destroying your competitor's market share.

Example Usage

The virulence of the social media backlash caught the marketing team completely off guard—three trending hashtags in under an hour.

Source: Medical and viral marketing terminology

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