Staphylococcus haemolyticus Streptococcus agalactiae* Streptococcus anginosus group* (includes S. anginosus, S. intermedius and S. constellatus) Streptococcus pyogenes* Viridans group streptococci Citrobacter freundii* Citrobacter koseri Enterobacter aerogenes Enterobacter cloacae* Escherichia coli* Klebsiella oxytoca* Klebsiella pneumoniae* Serratia marcescens Clostridium perfringens† Peptostreptococcus spp .† Prevotella spp.