Population Structure and Antimicrobial Resistance of Invasive Serotype IV Group B Streptococcus, Toronto, Ontario, Canada

Teatero, Sarah; McGeer, Allison; Li, Aimin; Gomes, Janice; Seah, Christine; Demczuk, Walter; Martin, Irene; Wasserscheid, Jessica; Dewar, Ken; Melano, Roberto G.; Fittipaldi, Nahuel

doi:10.3201/eid2014.140759

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Population Structure and Antimicrobial Resistance of Invasive Serotype IV Group B Streptococcus, Toronto, Ontario, Canada

Published Date:

Apr 2015

Publisher's site:

http://dx.doi.org/10.3201/eid2014.140759

Source:

Emerg Infect Dis. 21(4):585-591.

[PDF-1.21 MB]

Details:

Alternative Title:

Emerg Infect Dis

Personal Author:

Teatero, Sarah ; McGeer, Allison ; Li, Aimin ; Gomes, Janice ; Seah, Christine ; ... More ▼

Description:

We recently showed that 37/600 (6.2%) invasive infections with group B Streptococcus (GBS) in Toronto, Ontario, Canada, were caused by serotype IV strains. We report a relatively high level of genetic diversity in 37 invasive strains of this emerging GBS serotype. Multilocus sequence typing identified 6 sequence types (STs) that belonged to 3 clonal complexes. Most isolates were ST-459 (19/37, 51%) and ST-452 (11/37, 30%), but we also identified ST-291, ST-3, ST-196, and a novel ST-682. We detected further diversity by performing whole-genome single-nucleotide polymorphism analysis and found evidence of recombination events contributing to variation in some serotype IV GBS strains. We also evaluated antimicrobial drug resistance and found that ST-459 strains were resistant to clindamycin and erythromycin, whereas strains of other STs were, for the most part, susceptible to these antimicrobial drugs.

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Document Type:

Journal Article

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Emerging Infectious Diseases

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