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3. Tetanus and Lockjaw

Tetanus results from a bacterial toxin attacking the nervous system. Though it has many symptoms, lockjaw is the most common. Because of this, the two terms were once synonymous. While tetanus was the leading cause of lockjaw, immunizations have reduced its prevalence. This has led to a separation of the terms and experts now view lockjaw as a possible symptom of many different issues.

tetanus vaccine shot Hailshadow / Getty Images

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