Sentence:  If the bacillus, discovered in 1884 by Lustgarten,” in Weigert's laboratory, is really the specific virus of syphilis, this bacillus undoubtedly belongs to the general <WSD>acrodynamic</WSD> bacteria, though giving rise to a remarkably slow dynamic evolution of the organisms, this latter remaining unusually long in the different states that correspond to the different degrees of the dynamic evolution of syphilis. 
Meaning of the word marked with <WSD> tags:  Giving rise to an acquired immunity.