Park Chi Hye, Robicsek Ari, Jacoby George A, Sahm Daniel, Hooper David C
Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114-2696, USA.
Antimicrob Agents Chemother. 2006 Nov;50(11):3953-5. doi: 10.1128/AAC.00915-06. Epub 2006 Sep 5.
Among 313 Enterobacteriaceae from the United States with a ciprofloxacin MIC of >/=0.25 microg/ml and reduced susceptibility to ceftazidime, aac(6')-Ib was present in 50.5% of isolates, and of these, 28% carried the cr variant responsible for low-level ciprofloxacin resistance. aac(6')-Ib-cr was geographically widespread, stable over time, most common in Escherichia coli, equally prevalent in ciprofloxacin-susceptible and -resistant strains, and not associated with qnr genes.
在美国313株对环丙沙星的最低抑菌浓度(MIC)≥0.25μg/ml且对头孢他啶敏感性降低的肠杆菌科细菌中,50.5%的分离株存在aac(6')-Ib,其中28%携带导致低水平环丙沙星耐药的cr变异体。aac(6')-Ib-cr在地理上分布广泛,随时间稳定,在大肠杆菌中最常见,在环丙沙星敏感和耐药菌株中同样普遍,且与qnr基因无关。