Molecular analysis of Lancefield group C/G streptococci causing human infections in Sheffield, UK.
This study presents the first comprehensive genomic analysis of Lancefield group C/G streptococci in Sheffield, UK, revealing a highly diverse *Streptococcus dysgalactiae* subsp. *equisimilis* population with significant antimicrobial resistance, the presence of a globally virulent lineage, and evidence of long-term host persistence, thereby highlighting the urgent need for enhanced national genomic surveillance.