[Pseudomonas aeruginosa isolated in immunocompromised patients: antimicrobial resistance, serotyping, and molecular typing].

Abstract:

OBJECTIVE:Our study dealt with antibiotic resistance and serotypes of Pseudomonas aeruginosa strains isolated from immunocompromised patients in the National Bone Marrow Transplant Center of Tunis as well as molecular typing of ceftazidime resistant strains (CAZ-R). DESIGN:We studied a total of 87 non-replicate P. aeruginosa isolates from 36 patients (84 strains) or the hospital environment (3 strains). RESULTS:Rates of antimicrobial resistance were 36% for ceftazidime, 16% for imipenem, 38% for amikacin, and 57% for ciprofloxacin. The 31 CAZ-R strains were associated with O:11 serotype in 84% of the cases. Genetically characterization of CAZ-R strains by Pulsed Field Gel Electrophoresis (PFGE) after digestion of genomic DNA with SpeI revealed 2 genotypic groups. The first was composed of strains isolated from one outpatient between November 1998 and April 1999. Resistance phenotypes of these strains varied after use of antimicrobial drugs. The second was predominant (18/31 CAZ-R strains) in both hematology and graft units and persisted from June 1998 to June 2000 among 5/8 patients. These strains had O:11 serotype in 78% of the cases. The strains of this group were not isolated on patient admission and were isolated from 2 washbasins in the graft unit in May 1999. CONCLUSION:These results suggest the spread of multidrug-resistant O:11 P. aeruginosa clone from a tap water among hospitalized patients in our center, emphasizing the need of standard control of washbasins to eradicate this reservoir.

journal_name

Med Mal Infect

authors

Kalai S,Achour W,Abdeladhim A,Bejaoui M,Ben Hassen A

doi

10.1016/j.medmal.2005.08.006

keywords:

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

530-5

issue

11

eissn

0399-077X

issn

1769-6690

pii

S0399-077X(05)00214-3

journal_volume

35

pub_type

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