The postantibiotic effect （PAE） is defined as the suppression of bacterial growth persisting after a short exposure of bacterial cultures to an antibiotic. This phenomenon has obvious clinical interest, because antibiotic agents which produce extensive PAEs could be administrated less frequently without reducing efficacy. The minimum inhibitory concentration （MIC） and PAE of tulathromycin and erythromycin on five isolates of Actinobacillus pleuropneumonia were determined. All strains were susceptible to tulathromycin （ MIC： 0.25 - 1.00 μg/ml） and resistant to erythromycin （MIC： 32 -128 μg/ml）. The mean PAEs of 1 xMIC, 2 xMIC, 4 xMIC and 8 xMIC of tulathromycin against the tested isolates were 0.62, 1.53, 2.70 and 4.50, respectively. These results indicated that tulathromycin might be administered at longer time intervals than those already applied. This is in tavorite of the clinical rational use of antimicrobial druqs.
BAI Ru-nianLI Zhi-yuanWU Cong-mingZHOU LeiCAO Xing-yuan
