sitafloxacin and Gram-Positive-Bacterial-Infections

Sitafloxacin is a new quinolone active against multi-resistant Gram-positive pathogens. An open study was conducted in patients with serious systemic infections with methicillin-resistant Staphylococcus aureus (MRSA) or vancomycin-resistant enterococcus (VRE). Patients with MRSA were recruited if treatment with glycopeptides had failed. Of 11 patients with MRSA infection, four were cured, six failed treatment and one was indeterminate. Of nine patients with VRE infection (one patient had both pathogens), five were cured and four failed. Fifteen adverse events in 12 patients were potentially related to the study drug. Sitafloxacin was effective in VRE and some recalcitrant MRSA infections.

Topics: Adolescent; Adult; Aged; Anti-Infective Agents; Enterococcus; Fluoroquinolones; Gram-Positive Bacterial Infections; Humans; Methicillin Resistance; Middle Aged; Staphylococcal Infections; Staphylococcus aureus; Vancomycin Resistance

DQ-113 was compared in vitro to sitafloxacin, moxifloxacin, levofloxacin, and ciprofloxacin for potential to select mutational resistance in multiresistant staphylococci, pneumococci, and enterococci. Its ability to select less-susceptible mutants varied according to species, being lowest with staphylococci, intermediate with pneumococci, and greatest with enterococci.

Topics: Drug Resistance, Bacterial; Drug Resistance, Microbial; Fluoroquinolones; Gram-Positive Bacterial Infections; Gram-Positive Cocci; Microbial Sensitivity Tests; Quinolones

The in vitro activity of DU-6859a (DU), a new fluoroquinolone agent, was evaluated against 233 gram-positive cocci and was compared with those of ciprofloxacin, vancomycin, nafcillin, and ampicillin. The MICs of DU for 90% of the staphylococci tested were < or = 0.06 microgram/ml. All of the groups A and B and viridans group streptococci were inhibited by < or = 0.125 microgram of DU per ml, which was 32-fold more active than ciprofloxacin. On the basis of MICs for 90% of the strains tested, DU was 32- and 16-fold more active than ciprofloxacin against Enterococcus faecalis and Enterococcus faecium, respectively. The bactericidal activity of DU was demonstrated by time-kill techniques against all ciprofloxacin-susceptible enterococci. DU shows promise for the treatment of infections with gram-positive cocci and warrants further evaluation by in vitro and in vivo studies.

Topics: Anti-Bacterial Agents; Anti-Infective Agents; Drug Resistance, Microbial; Fluoroquinolones; Gram-Positive Bacterial Infections; Gram-Positive Cocci; Humans; Microbial Sensitivity Tests; Quinolones