Primary infections |
Erysipelas | Group A streptococci (Streptococcus pyogenes) |
Impetigo | Staphylococcus aureus (including methicillin-resistant strains), group A streptococci |
Lymphangitis | Group A streptococci; occasionally S. aureus |
Cellulitis | Group A streptococci, S. aureus (potentially including methicillin-resistant strains); occasionally other gram-positive cocci, gram-negative bacilli, and/or anaerobes |
Necrotizing fasciitis |
Type I | Anaerobes (Bacteroides spp., Peptostreptococcus spp.) and facultative bacteria (streptococci, Enterobacteriaceae) |
Type II | Group A streptococci |
Type III | Clostridioides perfringens |
Secondary infections |
Diabetic foot infections | S. aureus, streptococci, Enterobacteriaceae, Bacteroides spp., Peptostreptococcus spp., Pseudomonas aeruginosa |
Pressure sores | S. aureus including methicillin-resistant strains, streptococci, Enterobacteriaceae, Bacteroides spp., Peptostreptococcus spp., P. aeruginosa |
Bite wounds |
Animal | Pasteurella spp., S. aureus, streptococci, Bacteroides spp. |
Human | Eikenella corrodens, S. aureus, streptococci, Corynebacterium spp., Bacteroides spp., Peptostreptococcus spp. |
Burn wounds | P. aeruginosa, Enterobacteriaceae, S. aureus, streptococci |