Open AccessRambach agar and SM-ID medium sensitivity for presumptive identification of Salmonella subspecies I-VI
Author(s) -
Sarina Pignato,
Anna Giammanco
Publication year - 1995
Publication title -
journal of medical microbiology/journal of medical microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 117
eISSN - 1473-5644
pISSN - 0022-2615
DOI - 10.1099/00222615-43-1-68
Subject(s) - subspecies , serotype , agar , biology , salmonella , microbiology and biotechnology , bacteriology , agar plate , enterobacteriaceae , bacteria , zoology , escherichia coli , genetics , gene
The cultural characteristics of 112 Salmonella serovars belonging to subspecies I-VI were examined on Rambach agar and SM-ID medium. Colonies showing the typical red coloration were seen with 100 of 112 serovars assayed on SM-ID, and with 87 of 112 on Rambach agar. Atypical colourless colonies were observed on Rambach agar with ONPG-negative serovars S. Choleraesuis, S. Isangi, S. Typhi S. Worthington and S. Yoff of the subspecies I, S. II 52:d:e,n,x,z15 of the subspecies II, S. IV 6,7:z4,z24:- and S. IV 11:g,z51:- of the subspecies IV, and S. 40:z35:- belonging to S. bongori (V) species. Atypical blue, blue-green, blue-violet or violet colonies were observed on both media with all the ONPG-positive serovars of the subspecies IIIa (four of four strains) and IIIb (six of six strains) and with one of the two ONPG-positive (out of five) strains of the subspecies VI. Four serovars of S. bongori showed blue-green colonies on Rambach agar and typical red colonies on SM-ID, although they were all ONPG-positive. These results suggest that SM-ID medium is more sensitive than Rambach agar. However, the relatively low sensitivity of both media makes them suitable for use only in association with a traditional selective medium in both medical and environmental bacteriology, as well as for epidemiological purposes.