Clinical Microbiology


LIM RambaQUICK™ StrepB Method

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For Group B Streptococcus (GBS) screening

Order References 

Please use these references when
contacting your local distributor:


CHROMagarTM Strep B ............. 5000 mL ....... SB282 (250 plates)
LIM RambaQUICKTM Strep B ..... 5000 mL ....... LB082 (1000 tests)

To download the certificate of analysis, please indicate your lot number below :


Medium Performance

For Group B Streptococcus (GBS) screening

LIM RambaQUICKTM StrepB is a selective enrichment broth designed to inhibit Enterococci, while allowing growth of GBS, and, therefore to raise the sensitivity of the prepartum screening method.

Classical Method recommends overnight broth incubation for classical LIM. LIM RambaQUICKTM StrepB can be used also with overnight incubation, but has an optimal differentiation at 6h only. 

Easier reading of CHROMagarTM StrepB plate thanks to an intense mauve colony colouration.

Medium Description

CHROMagar™, RambaQUICK™, AquaCHROM™ are trademarks created by Dr. A. Rambach.
All pictures of our products are CHROMagar property and should not be used without our acceptance.
                                                                                          Last update: 21-Jan-2020

Focus on Group B Streptococcus (GBS)

 The centers for Disease Control and Prevention guidelines for the prevention of perinatal Group B Streptococcal (GBS) infections recommend that pregnant women be tested at 35 to 37 weeks of pregnancy or GBS carriage by selective enrichment broth of vaginal/anorectal swab samples, followed by subculture on blood agar or chromogenic plates. 

Enterococci growth properties are very similar to the GBS. Enterococci are able to hinder the growth of GBS in traditional broths by competition. Thus, a source of false negative results still remains since the traditional broth enrichments (Todd-Hewitt, LIM) are not dedicated to the inhibition of Enterococci, which are actually part of the anorectal flora.

Despite the fact that CHROMagarTM StrepB helps differentiate Enterococci from GBS by producing colonies of a distinct colour the risk remains of high levels of Enterococci growth may obscure GBS colonies.

RambaQUICKTM StrepB is a selective enrichment additive designed to reduce the growth or Enterococci, while allowing growth of GBS. 



Comparison of culture-based methods for Group B Streptococcus detection in screening samples from pregnant women


B.Berg, M.Hatto, W.LeBar, D.Newton, C.Young University of Michigan Health System, Ann Arbor, MI

Prepartum vaginal/anorectal Group B Streptococcus screening: Improvement of the enrichment step by the broth additive RambaQUICK StrepB


Didier-Marc Poisson, Marie-Liesse Evrard. Microbiology Laboratory & Gynaecology Obstetric Ward, Centre Hospitalier Régional Orléans, FR
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