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A collection of 114 independentStreptococcus agalactiae strains, including 54 strains isolated from the cerebrospinal fluid (CSF) samples of neonates and 60 strains from asymptomatic patients, was characterized by pulsed-field gel electrophoresis (PFGE) of DNA restricted withSma I and by PCR analysis of thehylB gene. All strains were previously studied by multilocus enzyme electrophoresis (MLEE) (R. Quentin, H. Huet, F.-S. Wang, P. Geslin, A. Goudeau, and R. K. Selander, J. Clin. Microbiol. 33:2576–2581, 1995). Among these 114 strains, there were 92 PFGE patterns. Eleven genetic groups (A to K) were identified with 38% divergence. A more homogeneous group (PFGE group A) was defined, consisting of 73% of the strains previously identified as belonging to a particular MLEE phylogenetic group. A 162-kb fragment was identified as a marker of strains that invaded the central nervous system of neonates. It was detected in 69% of the PFGE patterns obtained with CSF isolates and in only 1.8% of the PFGE patterns obtained with carrier strains. ThehylB gene encoding hyaluronate lyase was amplified for all strains in our collection. Ten of 15 isolates belonging to an MLEE subgroup, previously described as being likely to cause invasive infection, had an insertion in thehylB gene (IS1548 ).

journal of clinical microbiology

Genetic Features of <i>Streptococcus agalactiae</i> Strains Causing Severe Neonatal Infections, as Revealed by Pulsed-Field Gel Electrophoresis and <i>hylB</i> Gene Analysis

Genetic Features of Streptococcus agalactiae Strains Causing Severe Neonatal Infections, as Revealed by Pulsed-Field Gel Electrophoresis and hylB Gene Analysis