GENUS VIBRIO 



963 



The Aerobic Groups of the Genus Vibrio O. F, Muller, 

 emendavit loeffler. 



Phosphorescence. 



1 



Present. Absent. 

 /. Albensis group. | 



Gelatine. 

 I 



Liquefied. Not liquefied. 



I VII. Terrigenus group. 



Pigment formation in alkaline. 

 Peptone water. 



Absent. Present. 



I VI. Drennani group. 



Cholera immune serum. 

 Dilutions of, or greater than, i in 200. 



I 



Agglutination. Agglutination absent or unknown. 



II. Cholera group. | 



Growths in gelatine stabs. 



Resembles true cholera. Does not resemble true cholera. 

 I V. Finkler-Prior group. 



Pigeon pathogenicity. 

 Small intramuscular injections. 



Quickly lethal. Effect slight, negative, or unknown. 



III. Metschnikovi group. IV. Gindha group. 



Only the cholera and the gindha groups concern us. 



Cholera Group. 

 Ruffer classifies the strains of the cholera group as follows:- — 



Series I. — A. Cholera immune serum. 



1. Agglutination positive. 



2. Castellani's saturation positive. 



3. Pfeiffer's reaction positive. 



4. Complement fixation positive. 



B. HcBmolysis negative. 

 Series II., El tor vibrios. — A. Cholera immune serum. 



1. Agglutination positive. 



2. Castellani's saturation positive. 



3. Pfeiffer's reaction positive. 



4. Complement fixation negative. 



B. Haemolysis strongly marked. 



