Title of the Congress : |
14th International Conference on Pseudomonas |
Title of your Abstract : |
Comparison between phenotypic and genotypic methods for detection of KPC-producer Pseudomonas aeruginosa |
Venue : |
LAUSANNE, SWITZERLAND |
From : |
Saturday, September 07, 2013 |
To : |
Wednesday, September 11, 2013 |
Abstract(Please copy/paste the abstract send to the congress) : |
ID: 15
Leila Azimi
Comparison between phenotypic and genotypic methods for detection of KPC-producer Pseudomonas aeruginosa
Leila Azimi1, AbdolaizRastegar Lari1, Babak Asghari1, Mina Bustanshenas1, Faranak Alinejad2
Antimicrobial Resistance Research Center, Tehran University of Medical Sciences, Tehran, Iran1, Motahhari Burn Research Center, Tehran University of Medical Sciences, Tehran, ISLAMIC REPUBLIC OF IRAN2
Background: Pseudomonas aeruginosa is an important opportunistic pathogen causing nosocomial infections in burned patients and make an important concern in care systems. Carbapenems are used for treatment of infections caused by multi drug resistance (MDR) P. aeruginosa. Production of Klebsiella pneumonia carbapenemase (KPC) is one of the mechanisms of resistance to carbapenems in MDR P. aeruginosa. The aim of this study was comparison of phenotypical methods, Modified Hodge Test (MHT) and use of boronic acid (BA) as an inhibitor and molecular test (PCR) for detection of KPC - producer P. aeruginosa. Materials and methods: In the present study 174 carbapenem resistant P. aeruginosa were isolated from hospitalized burned patients and identified by biochemical tests. According to CLSI, MHT was conducted for all isolates and synergism test between meropenem and BA was tested in strains with clover life shape in MHT. Synergism effect of meropenem and cloxacillin was calculated for removal false positive responds in BA positive test. Finally, PCR assay was performed with 5 different specific primers for molecular identification of kpc gene. Results: Seventy strains have MHT positive. Ten out of 70 have synergism effect between meropenem and BA. BA has inhibition activity alone only in 3 isolates and 7 strains have disparity in inhibition zone by cloxacillin too. Two of 70 MHT test positive strains showed the specific amplification fragment for kpc gene which is only one of them has synergism effect with BA. Conclusion: MHT can use for primary screening of carbapenemases producer P. aeruginosa for excellent sensitivity but has low specificity for detection of KPC. Also, only 3 MHT positive isolates have positive synergism test with BA and just one strain among them have specific band after PCR. In conclusion PCR method is nevertheless a golden standard for this aim.
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Keywords of your Abstract : |
Pseudomonas, KPC, phenotypic methods, genotypic methods |
Acceptance Letter : |
http://gsia.tums.ac.ir/images/UserFiles/11575/Forms/306/Lettre_Ambassade_AZIMI_13_05_12_1_.pdf |
The presentation : |
Poster |
The Cover of Abstract book : |
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Published abstract in the abstract book with the related code : |
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none |
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