Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Diana to Dreadnought


Diphtheria, acute contagious disease caused by Corynebacterium diphtheriae, characterized by the formation of a soft crust (pseudomembrane) that forms in the inflamed throat, and by tissue damage in the heart and nervous system, a result of poisons produced by the bacteria. An effective vaccine prevents diphtheria.

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