CHROMagar™ StrepB

For the isolation and differentiation of Group B Streptococcus (S. agalactiae)

Order References

Please use these references when
contacting your local distributor :

5000 mL Pack ……….. SB282

Included : base SB282(B) + supplements SB282(S1) + SB282(S2)

25 L Pack ……………… SB283-25

Included : base SB283-25(B) + supplements SB283-25(S1) + SB283-25(S2)


Colonies Appearance

<img class="vce-single-image" src="" width="434" height="433" alt="" title="strepb" />

Group B Streptococcus 


<img class="vce-single-image" src="" width="539" height="539" alt="" title="other" />

Other Microorganism

Blue, colourless or inhibited


GBS in pregnant women: The Group B Streptococci (GBS), also known under the name of Streptococcus agalactiae, are the cause of numerous infections in adults but mostly an important cause of serious neonatal infections, occuring in the three first weeks of life. Studies indicate that approximately 12-27 % of pregnant women are colonised by GBS. (WHO, Infectious diseases, Group B Streptococcus). Detecting vaginal (and in some countries also rectal) colonisation by GBS in pregnant women is the most effective strategy to prevent infection transmission during baby delivery.


Worldwide, official guidelines recommend prenatal screening of GBS in the last month of pregnancy. In GBS-carrying women, this screening allows determining the need of intrapartum antibiotic prophylaxy, which has been proved effective in preventing the infections occuring in the first week of life (known as early-onset GBS infections).

Intended Use

CHROMagar™ StrepB is a selective chromogenic culture medium that is intended to aid in the qualitative determination of Group B Streptococcus (GBS) colonization in pregnant women. This medium supports the growth of hemolytic and non-hemolytic GBS strains. The test is performed by direct, or after enrichment, plating of urine, vaginal and/or vagino/rectal swabs obtained from pregnant women. CHROMagar™ StrepB results can be interpreted after 18-24 h aerobic incubation at 35-37 °C.

CHROMagar™ StrepB is not intended to diagnose infection nor to guide nor monitor treatment for infections. Further identification, susceptibility testing and epidemiological typing is needed on suspect colonies.

1.  Easy Interprétation : Easier reading thanks to an intense mauve colony colouration.

4. Fast : Results in 18-24h.

2. High sensitivity : Detection of GBS, including non haemolytic strains, with sensitivity close to 100 %.

5. Simplicity : Incubation in aerobic conditions. No need of CO2. Confirmation by latex agglutination can be performed directly from the colony.

3. High specificity : Differentiation of GBS from other bacteria by selective inhibition or by counter-colouration.

<img class="vce-single-image" src="" width="1024" height="515" alt="" title="Data EN" />


<img class="vce-single-image" src="" width="720" height="480" alt="" title="Composition EN" />

Technical Documents

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

Scientific Publications