Gram positive:

• Streptococci group A/B/C/G

• S. pneumoniae

• S. anginosus group

• E. faecalis

• L. monocytogenes

Gram negative:

• N. meningitidis

Anaerobic:

• Actinomyces

• Prevotella melaninogenica

• Clostridia

• Peptostreptococci