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Objective To analyze the distribution and antimicrobial resistance of Pseudomonasaeruginosa(P. aeruginosa)in a county-level hospital,provide reference for rational antimicrobial use,and promote the control and prevention of healthcare-associated infection (HAI).Methods Data of P.aeruginosaisolated from patients in a hospital between 2010 and 2012 were analyzed statistically.Results A total of 369 P.aeruginosaisolates were iso-lated,strains were mainly from specimens of sputum(n= 234,63.41% ),urine(n= 41,11.11% )and wound(n= 28, 7.59% );most strains were from intensive care unit(n= 146,39.56% ),respiratory diseases department(n= 51, 13.82% )and neurosurgical department(n= 37,10.03% ).P.aeruginosastrains were not resistant to polymyxin B;the resistance rates to imipenem,meropenem,cefoperazone/sulbactam,piperacillin/tazobactam and amikacin were all low(6.81% -22.73% );from 2010 to 2012,resistance rates to antimicrobial agents (except polymyxin B) increased with varying degrees,some antimicrobial agents showed statistical difference(P<0.05).Conclusion P. aeruginosais mainly isolated from respiratory specimens,mainly distributed in departments with serious patients;and resistance to most antimicrobial agents is high,resistance tendency is increasing,surveillance should be intensi-fied.
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Objective To investigate the genotype of metallo-?-lactamases (MBL) produced by carbapenem resistant Pseudomonas aeruginosa in pediatric patients.Methods 59 strains of resistance to imipenem or meropenem were collected from December 2003 to November 2005 in Beijing children's hospital.Isolates were further evaluated for MBL production by two screening methods.MBL Etest strips were used to screen the phenotype of MBL production.Molecular screening for blaVIM,blaIMP,blaSPM and blaGIM was carried out using primers targeting the conserved regions of the MBL genes.The PCR fragments obtained with integron primers were sequenced on both strands.The nucleotide sequences were compared with sequences available over the Internet.Results Of the 59 carbapenem resistant Pseudomonas aeruginosa included in this study,29 (49.2%)were MBL positive using Etest methods,and 39 (66.1%) of these tested positive for MBL genes by PCR.35 (89.7%) were positive for blaIMP genes and 4 (10.3%) were positive for blaVIM genes.All isolates were negative for SPM and GIM DNA sequencing revealed that the IMP-1 was detected in 35 IMP-producing isolates,and VIM-2 was detected in 4 VIM-producing isolates.Conclusions This study has demonstrated that MBL-producing strains in pediatric are more common than in adult.IMP-1-producing strains are the main in pediatric,and VIM-2-producing strains concurred.The production of MBL is one of the important reasons of carbapenem resistant Pseudomonas aeruginosa in pediatric.It is very important to monitor the production of MBL.
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AIM:To investigate the kinetics of tumor necrosis factor alpha(TNF-?)in an animal model of chronic P.aeruginosa biomembrane associated with lung infection.METHODS:Rats were challenged with 0.1 mL of PAO579(1012 CFU/L)in alginate beads or 0.1 mL of planktonic PAO579(1012 CFU/L).After challenging for 3,7 and 14 d,bacteriological and pathological features,and TNF-? expression in lung tissue were observed.RESULTS:(1)CFU/lung in alginate beads group was significantly higher than that in planktonic bacteria group(P