Antimicrobial activity of LY164846, a new oral cephalosporin, and recommendations for disk diffusion tests.

LY164846 is a new oral cephalosporin with a limited spectrum of antimicrobial activity that includes staphylococci (other than methicillin-resistant), streptococci (other than enterococci), Haemophilus influenzae (beta-lactamase-negative and beta-lactamase-positive), Branhamella catarrhalis (beta-lactamase-negative and beta-lactamase-positive), and Neisseria species (beta-lactamase negative and beta-lactamase-positive). The tentative recommendations for susceptibility breakpoints are less than or equal to 4 micrograms/ml and greater than or equal to 19 mm for susceptible, 8 micrograms/ml and 15-18 mm for intermediate, and greater than or equal to 16 micrograms/ml and less than or equal to 14 mm for resistant.