Gram-positive bacteria primarily associated with Erysipelas?

Gram-positive bacteria primarily associated with Erysipelas?

• A. Streptococcus pneumoniae
• B. Streptococcus pyogenes
• C. Staphylococcus aureus
• D. Staphylococcus epidermidis

Answer: (B)

Erysipelas presents as a well-demarcated, raised, red plaque on the skin with fever, and it classically results from infection by group A Streptococcus, Streptococcus pyogenes. This organism is Gram-positive and appears as cocci in chains that beta-hemolyze on blood agar, reflecting its classification and virulence for superficial dermal and lymphatic invasion. Those features explain why it’s the typical cause of erysipelas. While other Gram-positive bacteria can cause skin problems, they don’t fit this pattern as well: Streptococcus pneumoniae is a Gram-positive diplococcus mainly linked to respiratory infections; Staphylococcus aureus is a Gram-positive coccus in clusters often causing non-demarcated cellulitis or abscesses; Staphylococcus epidermidis is a coagulase-negative skin commensal associated with device-related infections rather than classic erysipelas.

Erysipelas presents as a well-demarcated, raised, red plaque on the skin with fever, and it classically results from infection by group A Streptococcus, Streptococcus pyogenes. This organism is Gram-positive and appears as cocci in chains that beta-hemolyze on blood agar, reflecting its classification and virulence for superficial dermal and lymphatic invasion. Those features explain why it’s the typical cause of erysipelas. While other Gram-positive bacteria can cause skin problems, they don’t fit this pattern as well: Streptococcus pneumoniae is a Gram-positive diplococcus mainly linked to respiratory infections; Staphylococcus aureus is a Gram-positive coccus in clusters often causing non-demarcated cellulitis or abscesses; Staphylococcus epidermidis is a coagulase-negative skin commensal associated with device-related infections rather than classic erysipelas.