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Because of divergent results obtained with the complement fixation test in gonorrhea regardless of the clinical course of the infection, Erik Vollmond, in consideration of these results, presumed that the gonococcus, like the meningococcus and other bacterial species constitute a heterogeneous family, comprising types with different antigenic properties. He believes, as the result of serologic studies, that most gonococcus strains can be arranged in three types (I, II and III). The type I infection is less severe than the other two.
Studies of Gonococcus Types and Gonococcus Immune Serums.. Arch Intern Med (Chic). 1926;38(3):412. doi:10.1001/archinte.1926.00120270135017