The main objective of this study : Demonstrate that GBS (group B streptococci) "ST-17" colonize and persist to 60 days twice in the digestive tract of newborns that strains of GBS non-ST-17. Secondary objectives:Determine: * The frequency of colonization with GBS ST-17 and GBS non-ST-17 of at risk pregnant women. * The frequency of colonization of neonates by GBS ST-17 at birth. * The preferential site of colonization in the mother (rectum, vagina, breast milk). * The kinetics of colonization after birth in the newborn. * The sensitivity and specificity of different GBS detection methods (conventional phenotypic versus molecular) in the different types of samples from the mother and the newborn.
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Detection of the hyper-virulent ST17 clone of Group B Strep
Timeframe: at 60 days post delivery