Viridans group streptococci

Microbiology

• Gram-positive cocci
• Commensal oral flora

Organisms

• S. anginosus group (previously milleri group): most likely to cause invasive pyogenic infections similar to Staphylococcus aureus
  • S. anginosus
  • S. intermedius
  • S. constellatus
• S. mitis group
  • S. mitis
  • S. oralis
• S. sanguinis group
  • S. gordonii
  • S. sanguinis
  • S. parasanguinis
• S. salivarius group
  • S. salivarius
  • S. vestibularis
  • S. thermophilus
• S. mutans group
  • S. mutans

Further Reading

• It’s Not Easy Being Green: the Viridans Group Streptococci, with a Focus on Pediatric Clinical Manifestations. J Clin Microbiol. 2010;48(11):3829-3835. DOI: 10.1128/JCM.01563-10