carriage of qnra1 and qnrb2, blactx-m15, and complex class 1 integron in a clinical multiresistant citrobacter freundii isolate. | a multiresistant citrobacter freundii strain was recovered from a catheter from a patient hospitalized in aveiro, portugal. this strain harbored quinolone resistance genes, qnra1 and qnrb2, both in a large plasmid. | 2010 | 20338709 |