Yersin Yer·sin (yěr-sāɴ'), Alexandre Émile John. 1863-1943.
Swiss-born French bacteriologist. His work with the diphtheria bacillus led to the development of antitoxins to neutralize pathogenic toxins.
|Yersin (yěr-sä') Pronunciation Key
French bacteriologist who, working with Émile Roux, isolated the toxin that causes the symptoms of diphtheria. Yersin later discovered the bacillus that causes bubonic plague and developed a serum to protect against it.