Fluoroquinolone Resistance among Clonal Complex 1 Group B Streptococcus Strains

Area of Science:

• Microbiology
• Genetics
• Infectious Diseases

Background:

• Fluoroquinolone resistance in Group B Streptococcus (GBS) is a significant and increasing global health issue.
• GBS is an opportunistic pathogen causing invasive diseases, particularly in neonates.

Purpose of the Study:

• To investigate the genetic basis of fluoroquinolone resistance in Group B Streptococcus.
• To correlate specific gene mutations with observed fluoroquinolone resistance in GBS strains.
• To establish a foundation for predicting fluoroquinolone resistance using whole-genome sequencing data.

Main Methods:

• Whole-genome sequencing (WGS) was employed to analyze 190 strains of clonal complex 1 Group B Streptococcus.
• Genomic data was mined to identify mutations in the gyrA, gyrB, parC, and parE genes.
• Strains were recovered from patients diagnosed with invasive diseases in North America.

Main Results:

• A notable prevalence of fluoroquinolone resistance (12%) was identified among the studied GBS strains.
• Specific mutations within the gyrA, gyrB, parC, and parE genes were correlated with fluoroquinolone resistance.
• The study successfully identified genetic markers associated with resistance.

Conclusions:

• The findings provide crucial insights into the genetic mechanisms driving fluoroquinolone resistance in Group B Streptococcus.
• This research represents a significant advancement in predicting fluoroquinolone resistance in GBS through WGS data analysis.
• Understanding these mutations is vital for effective treatment strategies and combating antimicrobial resistance in GBS infections.