Aerobic Gram-Positive Microorganism: Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyrogens.
Aerobic Gram-negative Microorganisms: Haemophilus Influenzae, Moraxella catarrhalis.
Other Microorganism: Mycoplasma pneumoniae, Chlamydia pneumoniae (TWAR).
Mycobacteria: Mycobacterium avium complex(MAC) consisting of: Mycobacterium avium, Mycobacterium intracellulare.
Beta lactamase production should have no effect on clarithromycin activity.