Group B Streptococcus (GBS, Strep Agalacatiae)

Last updated 30.06.13

Definition

-  Streptococcus bacteria identified by Group B Lancefield antigen

-  Known as Strep agalactiae

 

Features

-  G+ cocci bacteria

-  Facultative

-  Beta-haemolytic

-  Identified by Group B Lancefield antigen = GBS

-  Found in 20-40% women, normal GIT or urogenital tract flora

-  15-25% asymptomatic carriers

-  0.5% of asymptomatic carriers will have neonates with sepsis if untreated

 

Clinical Considerations

-  Meningitis - Paediatric

-  GBS in Pregnancy

 

Ix

-  Part of antenatal screening generally recommended at 35-37 weeks gestation

-  Cultures takes 24-48hrs to become positive

 

Mx

-  Usually sensitive to Penicillin, await MCS

-  Erythromycin or Clindamycin if allergic

-  See GBS in Pregnancy

 

Strep

 

 

 

References

 

Pic: http://archive.microbelibrary.org/ASMOnly/Details.asp?ID=2424