Postantibiotic effects and postantibiotic sub-MIC effects of erythromycin, roxithromycin, tilmicosin, and tylosin on Pasteurella multocida.
When intermittent dosing is used during treatment, the concentrations of antibiotics fluctuate and subinhibitory concentrations may occur between doses. Postantibiotic effects (PAEs) and postantibiotic subinhibitory effects (PA SMEs) on bacteria may provide additional, valuable information for the rational use of a drug in clinical practice. In this study tilmicosin was the most active antibiotic tested against P. multocida type D with MICs ranging from 4-16 mg/l. Roxithromycin and tilmicosin induced a statistically significantly longer PAE than did tylosin against P. multocida types A and D (P < 0.05). The duration of PAEs and PA SMEs were proportional to the concentrations of drugs used for exposure. The PA SMEs were substantially longer than PAEs on P. multocida. Tilmicosin had a longer PA SME compared with erythromycin, roxithromycin and tylosin for P. multocida. The computerized incubator used in the present study provided an efficient and convenient determination of PAE and PA SME, allowing frequent measurements of the bacterial growth.
Lim
J
J
Division of Veterinary Pharmacology and Toxicology, Chungnam National University, 220 Kung-dong, Yusong-ku, Taejon, South Korea.
Yun
H
H
D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004917:Erythromycin / Q000008:administration & dosage / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D018942:Macrolides; D008826:Microbial Sensitivity Tests; D010326:Pasteurella Infections / Q000188:drug therapy / Q000378:metabolism / Q000382:microbiology; D016979:Pasteurella multocida / Q000187:drug effects* / Q000254:growth & development; D015575:Roxithromycin / Q000008:administration & dosage / Q000494:pharmacology; D015645:Tylosin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology
D000900:Anti-Bacterial Agents; D018942:Macrolides; D015575:Roxithromycin; D004917:Erythromycin; C052319:tilmicosin; D015645:Tylosin