the oral and subcutaneous activities of azithromycin , erythromycin , and cefaclor were similar against acute systemic infections produced by streptococcus pneumoniae , streptococcus pyogenes , streptococcus viridans , or s. aureus , whereas azithromycin was more potent than erythromycin and cefaclor against the intracellular pathogen listeria monocytogenes .
C0014806
erythromycin
C0052796
azithromycin