title: Detection of New Delhi metallo beta lactamase-1 (NDM-1) carbapenemase in Pseudomonas aeruginosa in a single centre in southern India.
abstract: OBJECTIVE
  New Delhi metallo β-lactamase-1 (NDM-1) producing Pseudomonas aeruginosa isolates are potential threat to human health. This study was conducted to detect the presence of bla(NDM-1) in carbapenem resistant P. aeruginosa in a tertiary care center in southern India.
  
  
  METHODS
  Sixty one carbapenem resistant clinical isolates of a total of 212 P. aeruginosa isolates cultured during the study period were screened for the presence of NDM-1by PCR. Clinical characteristics of the NDM-1 positive isolates were studied and outcome of the patients was followed up.
  
  
  RESULTS
  Of the 61 isolates, NDM-1 was detected in four isolates only. These were isolated from patients in the intensive care units and chest medicine ward. The source specimens were pus, sputum, bronchoalveolar lavage and endotracheal aspirate. The NDM-1 producers were susceptible only to polymyxin B. Only one patient responded to polymyxin B therapy, while the others succumbed to the infection.
  
  
  CONCLUSIONS
  These findings reveal that NDM-1 is not a major mechanism mediating carbapenem resistance in P. aeruginosa in this centre. However, continuous surveillance and screening are necessary to prevent their dissemination.
authors.forename: Mariappan
authors.initials: M
authors.lastname: Shanthi
authors.affiliation: Department of Microbiology, & Sri Ramachandra Medical College & Research Institute, Sri Ramachandra University, Chennai, India.
authors.forename: Uma
authors.initials: U
authors.lastname: Sekar
authors.forename: Arunagiri
authors.initials: A
authors.lastname: Kamalanathan
authors.forename: Balaraman
authors.initials: B
authors.lastname: Sekar
mesh_terms: D018893:Bronchoalveolar Lavage; D015780:Carbapenems / Q000627:therapeutic use; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics*; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D011112:Polymyxin B / Q000008:administration & dosage; D011552:Pseudomonas Infections / Q000188:drug therapy* / Q000382:microbiology / Q000473:pathology; D011550:Pseudomonas aeruginosa / Q000201:enzymology* / Q000302:isolation & purification; D013183:Sputum / Q000187:drug effects / Q000382:microbiology; D062606:Tertiary Care Centers; D001618:beta-Lactamases / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D015780:Carbapenems; D001618:beta-Lactamases; C552864:beta-lactamase NDM-1; D011112:Polymyxin B