PASTEURELLA 



943 



Smith's Non-Indol-Producing Division. 



This division contains only one organism, Escherichia coli muta- 

 bilis Massini, insufficiently described. 



TRIBE PASTEURELLE^ Castellani and Chalmers, 1918. 



Definition. — Bacillaceaewith good growth on ordinary media, with- 

 out endospores, aerobic, without fluorescence or pigment formation, 

 unable to liquefy gelatine, and Gram-negative, but with polar staining. 



Type Genus. — Pasteurella Toni and Trevisan, if ~ 



Genus Pasteurella Toni and Trevisan, i( 

 Definition. — Pasteurelleae with the tribal characters. 

 Type Species. — Pasteurella cholercegallinarum (Zopf, 1885), 

 Remarks. — -This genus was formed by Toni and Trevisan, and 

 includes all the organisms of the haemorrhagic septicsemic group, 

 and especially plague. It is to be noted that Pasteurella coscoroha 

 (Tretrop, 1900) belongs to this genus, as well as Pasteurella pestis 

 Kitasato and Yersin, 1894. The two great divisions, the animal 

 and the human diseases, may be separated as follows: — 



A. No growth on MacConkey's medium containing glucose, levulose 



galactose, or mannitol — Animal group. 



B. Growth on MacConkey's medium containing the above-mentioned 



sugars — Plague. 



This test must, however, be confirmed by animal inoculations. 

 TRIBE PROTEiE Castellani and Chalmers, 191 8. 



Definition. — Bacillacese growing well on ordinary laboratory 

 media, not forming endospores, aerobic, without fluorescence or 

 pigment formation, but liquefying gelatine. 



Type Species.— Pfo/^ws vulgaris Hauser, 1885. 



Classification. — The tribe may be divided into genera as follows : — 



A. Rapid gelatine liquefiers; do not ferment lactose; mostly 



Gram- positive — Proteus . 



B. Slow gelatine liquefiers; ferment lactose; Gram-negative 



— Cloaca. 



Genus Proteus Hauser, 1885, em. Castellani and Chalmers, 1918. 

 Type Species. — Proteus vulgaris Ha^user, 1885. 

 Remarks, — These organisms are of difficult classification, as the 

 serological reactions are not always in accord with the biochemical 

 characters. To this group belongs Proteus X^^ (see page 1336). 

 Some species may be separated as follows :■ — 



Saccharose. 

 _^ I 



No change. Acid and gas. 



Glucose. ^ Maltose. 



No change. Acid and gas. Acid and gas. No change. 



Metadiffluens. Diffluens. Proteus. Pavadiffluens. 



