FAMILY ENTEROBACTERIACEAE 



481 



Optimum temperature 25° to 30°C. 

 No growth at 37°C. 



Source: Described by Bizio (Joe. cit.) 

 and Sette {loc. cit.) from growth on corn 

 meal mush (polenta). 



Habitat: Water, soil, milk, foods, silk 

 worms and other insects. 



2. Serratia indica (Eisenberg) Bergey 

 et al. {Bacillus indicus Eisenberg, 

 Bakt. Diag., 1 Aufl., 1886, 1; Bacillus 

 indicus ruber Fliigge, Die Mikroorganis- 

 men, 2 Aufi., 1886, 285; Micrococcus 

 indicus Koch, Berichte ueber die Reise 

 zur Erforschung der Cholera, 1887; 

 Bacillus ruber indicus Kruse, in Fltigge, 

 Die ]Mikroorganismen, 3 Aufi., 2, 1896, 

 302; Bacterium ruber indicus Chester, 

 Ann. Rept. Del. Col. Agr. Exp. Sta., 9, 

 1897, 112; Erylhrobacillus indicus Hol- 

 land, Jour. Bact., 5, 1920, 218; Bergey 

 et al.. Manual, 1st ed., 1923, 88; Breed 

 and Breed, Jour, of Bact., 11, 1926, 76; 

 Chromobacterium indicum Topley and 

 Wilson, Princ. Bact. and Immun., 1, 

 1931, 402.) From Latin indicus, of 

 India. 



Small rods: 0.5 by 1.0 to 1.5 microns. 

 Motile with four peritrichous fiagella. 

 Gram-negative. 



Gelatin colonies: Resemble those of 

 Serratia marcescens. 



Gelatin stab : Liquefied rather quickl}'. 

 Brilliant orange-red pellicle on plain 

 gelatin. 



Agar colonies: Pink, with slightly 

 serrate margin, spreading, with green 

 irridescence. 



Agar slant : Luxuriant , dirty-white 

 layer. Pigment produced best in alka- 

 line media. 



Broth: Turbid, with white sediment. 



Litmus milk: Acid and coagulated. 

 Digestion complete in 10 days. 



Potato : Luxuriant growth with or with- 

 out pigment formation. 



Produces same products (except H2) 

 from glucose as does Serratia marcescens 



(Pederson and Breed, Jour. Bact., 16, 

 1928, 183). 



Indole not produced. 



Nitrites produced from nitrates. 



Growiih with pigment production in 

 distilled water containing urea, potassium 

 chloride and glucose. 



Blood serum liquefied. 



Odor of trimethylamine. 



Sodium formate broth : Cultures do not 

 produce visible gas (Breed). 



Pathogenic for laboratorj^ animals. 



Acetylmethylcarbinol is produced 

 (Breed). 



Aerobic, facultative. 



Optimum temperature 25° to 35°C. 

 No growth at 37°C. 



Cultures of this organism lose their 

 ability to produce the orange-red pellicle 

 on gelatin and then become practically 

 indistinguishable from cultures of Ser- 

 ratia marcescens. This would indicate 

 that this so-called species is a rough 

 strain of the former species (Breed). 

 See Reed (Jour. Bact., S4, 1937, 255) for a 

 discussion of dissociation phenomena in 

 this genus. 



Source : Isolated from alimentary tract 

 of a Java ape in India; also from milk 

 can from Ithaca, N. Y. 



Habitat : Presumably widely dis- 

 tributed. 



Apparently the following non-gelatin 

 liquefying strain belongs with this spe- 

 cies. Subcultures that are claimed to be 

 derived from the original now liquefy 

 gelatin. 



2a. Serratia miquelii Bergey et al. 

 (Named Bacillus ruber by Miquel and 

 described in a letter to Hefferan, Cent, f . 

 Bakt., II Abt., 11, 1903, 402; Erythro- 

 bacillus ruber Holland, Jour. Bact., 5, 

 1920, 223; Bergey et al., Manual, 1st ed., 

 1923, 95.) 



Isolated from water by Miquel. 



3. Serratia plymuthicum (Lehmann 

 and Neumann) Bergey et al. (Roter 



