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Age distribution of patients with invasive β-streptococcal infections, Japan, April 2010–March 2013. Streptococcus pyogenes, n = 336; Streptococcus agalactiae, n = 582; Streptococcus dysgalactiae subsp. equisimilis, n = 693. Means and SDs of ages in patients ≥18 years of age for each pathogen were the following: S. pyogenes (mean 61 years, SD ± 17), S. agalactiae (mean 70 years, SD ± 15), and S. dysgalactiae subsp. equisimilis (mean, 75 years, SD ± 15).
