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Antimicrob. Agents Chemother., Dec 1997, 2786-2789, Vol 41, No. 12
MA Visalli, MR Jacobs and PC Appelbaum
Activities of BAY 12-8039 against 205 pneumococci were tested by agar
dilution. MICs (in micrograms per milliliter) at which 50 and 90% of the
isolates are inhibited (MIC50s and MIC90s, respectively) were 0.125 and
0.25 (BAY 12-8039), 2.0 and 4.0 (ciprofloxacin and ofloxacin), and 0.25 and
0.5 (sparfloxacin). Beta-lactam MIC50s and MIC90s for
penicillin-susceptible, -intermediate, and -resistant strains, in that
order, were 0.016 and 0.03, 0.25 and 2.0, and 2.0 and 4.0 (amoxicillin);
0.03 and 0.06, 0.25 and 4.0, and 4.0 and 8.0 (ampicillin); 0.03 and 0.06,
0.5 and 4.0, and 4.0 and 8.0 (cefuroxime); and 0.03 and 0.125, 0.25 and
2.0, and 4.0 and 8.0 (cefpodoxime). At two times their MICs after 24 h, BAY
12-8039, ciprofloxacin, ampicillin, and cefuroxime were uniformly
bactericidal (99.9% killing) against 12 strains; other compounds were
bactericidal at four times their MICs.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Antipneumococcal activity of BAY 12-8039, a new quinolone, compared with activities of three other quinolones and four oral beta-lactams
Department of Pathology (Clinical Microbiology), Hershey Medical Center, Pennsylvania 17033, USA.
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