Definition
A serious bacterial infection caused by Corynebacterium diphtheriae that inflames the mucous membranes of your upper respiratory tract, essentially turning your throat into a hostile environment. Thanks to vaccines, it's now mainly something parents use to scare anti-vaxxers back to reality. Before immunization, this disease was a legitimate childhood nightmare that actually warranted the fear.
Example Usage
The pediatrician patiently explained that diphtheria vaccines have saved countless lives, despite what Karen read on Facebook.
Source: Medical terminology
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