15 Commonly susceptible species Aerobic Gram-positive micro-organisms Gardnerella vaginalis Staphylococcus aureus* (methicillin-susceptible) Streptococcus agalactiae (Group B) Streptococcus milleri group* (S. anginosus, S. constellatus and S. intermedius) Streptococcus pneumoniae* Streptococcus pyogenes* (Group A) Aerobic Gram-negative micro-organisms Haemophilus influenzae* Haemophilus parainfluenzae* Klebsiella pneumoniae*# Moraxella (Branhamella) catarrhalis* Anaerobic micro-organisms Fusobacterium spp.