OBJECTIVES: To study the prevalence, nature, involved genetic elements and epidemiology of metallo-beta-lactamase (MBL)-producing Pseudomonas aeruginosa and Pseudomonas putida isolated in a Spanish hospital between 2005 and 2008. METHODS: Etests were used for susceptibility testing and screening for MBLs, confirmed through bla(VIM) PCRs and sequencing. Clonal relatedness was evaluated by PFGE and multilocus sequence typing (MLST). MBL-carrying plasmids were characterized by restriction fragment length polymorphism, Southern blot and electroporation. MBL genetic elements were studied by cloning and sequencing. RESULTS: MBL-producing P. putida was detected in eight patients (one clone each; two harbouring bla(VIM-1) and six harbouring bla(VIM-2)), representing 14% of all the infections by the P. putida/fluorescens group. MBLs were detected in only 0.3% of P. aeruginosa infections (11 patients) during the same period. PFGE revealed four P. aeruginosa clones: one producing bla(VIM-13) (two patients); and three producing bla(VIM-2) (two patients, six patients and one patient, respectively). MLST indicated that the VIM-13 clone was the internationally spread sequence type (ST)235, while the major VIM-2 lineage corresponded to ST179, which is associated with chronic respiratory infections. The VIM-1 integron was shown to have both plasmid and chromosomal location, while the VIM-13 integron was only chromosomal. The VIM-2 integron was located in the same transposon (Tn402/Tn5053-like) in all P. aeruginosa and P. putida isolates, suggesting its crucial role in the dissemination of VIM-2. CONCLUSIONS: The high diversity and proportion of MBL-positive P. putida suggests an environmental reservoir of these resistance determinants. Dissemination of these multidrug resistance elements to successful P. aeruginosa clones presents a major epidemiological and clinical threat.
OBJECTIVES: To study the prevalence, nature, involved genetic elements and epidemiology of metallo-beta-lactamase (MBL)-producing Pseudomonas aeruginosa and Pseudomonas putida isolated in a Spanish hospital between 2005 and 2008. METHODS: Etests were used for susceptibility testing and screening for MBLs, confirmed through bla(VIM) PCRs and sequencing. Clonal relatedness was evaluated by PFGE and multilocus sequence typing (MLST). MBL-carrying plasmids were characterized by restriction fragment length polymorphism, Southern blot and electroporation. MBL genetic elements were studied by cloning and sequencing. RESULTS: MBL-producing P. putida was detected in eight patients (one clone each; two harbouring bla(VIM-1) and six harbouring bla(VIM-2)), representing 14% of all the infections by the P. putida/fluorescens group. MBLs were detected in only 0.3% of P. aeruginosa infections (11 patients) during the same period. PFGE revealed four P. aeruginosa clones: one producing bla(VIM-13) (two patients); and three producing bla(VIM-2) (two patients, six patients and one patient, respectively). MLST indicated that the VIM-13 clone was the internationally spread sequence type (ST)235, while the major VIM-2 lineage corresponded to ST179, which is associated with chronic respiratory infections. The VIM-1 integron was shown to have both plasmid and chromosomal location, while the VIM-13 integron was only chromosomal. The VIM-2integron was located in the same transposon (Tn402/Tn5053-like) in all P. aeruginosa and P. putida isolates, suggesting its crucial role in the dissemination of VIM-2. CONCLUSIONS: The high diversity and proportion of MBL-positive P. putida suggests an environmental reservoir of these resistance determinants. Dissemination of these multidrug resistance elements to successful P. aeruginosa clones presents a major epidemiological and clinical threat.
Authors: Xavier Mulet; Gabriel Cabot; Alain A Ocampo-Sosa; M Angeles Domínguez; Laura Zamorano; Carlos Juan; Fe Tubau; Cristina Rodríguez; Bartolomé Moyà; Carmen Peña; Luis Martínez-Martínez; Antonio Oliver Journal: Antimicrob Agents Chemother Date: 2013-08-26 Impact factor: 5.191
Authors: Leyre Lavilla Lerma; Nabil Benomar; María del Carmen Casado Muñoz; Antonio Gálvez; Hikmate Abriouel Journal: Appl Environ Microbiol Date: 2014-08-29 Impact factor: 4.792
Authors: Jianhui Xiong; Maxime Déraspe; Naeem Iqbal; Jennifer Ma; Frances B Jamieson; Jessica Wasserscheid; Ken Dewar; Peter M Hawkey; Paul H Roy Journal: Antimicrob Agents Chemother Date: 2016-10-21 Impact factor: 5.191
Authors: Jianhui Xiong; David C Alexander; Jennifer H Ma; Maxime Déraspe; Donald E Low; Frances B Jamieson; Paul H Roy Journal: Antimicrob Agents Chemother Date: 2013-05-28 Impact factor: 5.191