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SCHIZOMYCETES 



Classification.^ — The genus Neisseria includes the following species : 



1. N. gonorrhaecB (Bumm, 1885), which is the cause of gonorrhoea. 



2. N. intracellularis (Weichselbaum, 1887), which is one of the 

 organisms causing epidemic cerebro-spinal meningitis. 



3. N. sicca (von Lingelsheim, 1906). 



4. A^.y?a?;a (von Lingelsheim, 1906). 



5. N. pseudomeningitidis (Elser and Huntoon, 1909). 



6. N . parameningitidis (Dopter, 1909). 



7. A number of heterogeneous strains, separable by the agglutina 

 tion and absorption tests of specific immune sera. 



These various strains and groups can be differentiated from one 

 another by the tests set forth in the following diagnostic table: — 



Diagnostic Table of the Genus Neisseria Trevisan, 1885. 

 Glucose Agar. 



\ 



I 



Pigment absent. 



Glucose and maltose. 

 I 



Pigment present 

 (Flava Group). 



Glucose and maltose fermented 

 saccharose. 



Only glucose fermented 

 (Gonorrhoeal Group). 



Both fermented. 



Saccharose and 

 fructose. 

 I 



In gonorrhoeal infections. 

 Separable by absorp- 

 tion test. I 

 I. GonorvhcecB. 



Neither fermented 

 (Meningococcal 

 _ Group). 



Fermented. 

 7. E. and 

 H.* (I). 



No change. 



Fructose. 

 I 



Both 

 fermented. 

 6. Sicca. 



Fermented. No change. 



8. Flava. 



In epidemic cerebro- 

 spinal infections. 

 Separable by Castellani's absorption test. 



Specific intracellularis 

 agglutinins. 



9. E. and H.* 

 (III). 



E. and H. = Else 

 and Huntoon. 



Absorbed. 

 2. Intracellularis. 



Not absorbed. 



Specific pseudomeningitidis 

 agglutinins. 



Absorbed. 

 3. Psevidomeningitidis. 



Not absorbed. 



Specific parameningitidis 

 agglutinins. 

 I 



Absorbed. 

 4. Parameningitidis. 



Not absorbed, 

 5. Heterogeneous Group. 



