Gram positive

•  Streptococci

•  Enterococci

•  Listeria

Gram negative:

•  Neisseria meningitidis

•  Haemophilus influenzae beta-lactamase negative

Anaerobes

•  Actinomyces

•  non-difficile Clostridia

•  Peptostreptococci

Note: does not cover Staphylococci due to a penicillinase