Screening and detection of carbapenemases
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- Alaina Nichols
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1 Screening and detection of carbapenemases For many isolates with carbapenemases the MICs of carbapenems are around the susceptible breakpoint making resistance difficult to detect - particularly with automated systems. Therefore special zone breakpoints are needed in first line screening Strains with reduced susceptibility to Imipenem, Meropenem (both inhibition zone < 22 mm) or Ertapenem (zone < 21mm) on Mueller-Hinton Agar with McFarland 0.5 inoculum, should be suspected of possessing carbapenemases. Most isolates with KPC and GES enzymes are highly resistant to Ceftazidime. Ertapenem Neo-Sensitabs is the most sensitive indicator for possible carbapenemase, but in approximately 20 % of cases other resistance mechanisms are involved (confirmation of carbapenemase with Modified Hodge Test is necessary). It is important to recognize small resistant colonies growing inside the Ertapenem disk zone.
2 A) PROCEDURE FOR METALLO BETA LACTAMASE (MBL) DETECTION. ENTEROBACTERIACEAE Apply one Dipicolinic Acid Diatabs (DPA) on an inoculated Mueller Hinton (MH) plate. Apply one Meropenem Neo-Sensitabs and one Ertapenem Neo-Sensitabs onto the plate on either side of the DPA, 5mm from the DPA (edge to edge). Apply Imipenem + EDTA (IM+ED) on an inoculated MH plate. Apply one Meropenem Neo-Sensitabs and one Ertapenem Neo-Sensitabs at either side of the Imipenem + EDTA, 10 mm from the Imipenem + EDTA (edge to edge). NON FERMENTERS Apply one DPA Diatabs on the MH plate. Apply one Imipenem Neo-Sensitabs and one Meropenem Neo-Sensitabs at either side of the DPA, 5 mm from the DPA (edge to edge). Apply Imipenem + EDTA (IM+ED) on the inoculated MH plate. Apply one Meropenem Neo Sensitabs and one Ertapenem Neo-Sensitabs at either side of the Imipenem + EDTA, 10 mm from the Imipenem + EDTA (edge to edge). INTERPRETATION The use of two chelating agents EDTA and DPA will enhance the detection of metallo ß lactamases (MBL) in the clinical laboratory. A key hole or ghost zone between carbapenems (one or more) and Dipicolinic Acid indicates the presence of an MBL. A key hole or ghost zone between IM+ED and the carbapenems (one or more) indicates the prescence of an MBL. A key hole or ghost zone between carbapenems (one or more) and Dipicolinic Acid indicates the presence of a MBL. Please note: Most MH agar brands contain physiological levels of Zn ++ ions and should be used for carbapenem testing. Iso Sensitest agar has low levels of zinc ions and may give false susceptibility results for carbapenems in the presence of MBL. Some MH agar brands should also be supplemented with zinc ions (70 mg zinc sulphate. H 2 O per liter medium). This applies also to the Modified Hodge Test (MHT). Strains of Acinetobacter baumannii producing certain oxacillinases may give a false positive metallo-ß-lactamase test result. Screening and detection of carbapenemases version C Page 2
3 B) PROCEDURE FOR KPC CARBAPENEMASES DETECTION (CLASS A ENZYMES) Isolates giving negative metallo beta lactamase tests, may produce other carbapenemases. The most current are KPC enzymes isolated from Enterobacteriaceae (K. pneumoniae, E. coli, Enterobacter spp., P. mirabilis) particularly K. pneumoniae. To detect these strains in rectal swab screening samples, direct plating on McConkey agar in the presence of Ertapenem Neo Sensitabs and Imipenem Neo Sensitabs may be used. Place one Amoxycillin + Clavulanate Neo Sensitabs between one Ertapenem and one Imipenem Neo Sensitabs (distance 10 mm from edge to edge). Place one Boronic Acid Diatabs between one Ertapenem and one Imipenem Neo Sensitabs (distance mm from edge to edge). Perform Modified Hodge Test (MHT) with Ertapenem and Meropenem Neo Sensitabs. INTERPRETATION The following results will presumably indicate the presence of a KPC beta lactamase: a) Negative metallo beta lactamases tests. b) Positive synergy test between Boronic Acid and the carbapenems (one or both). c) Negative synergy test between Cloxacillin 500 μg and the carbapenems (11). d) Positive synergy test between clavulanate (AMC) and carbapenems (one or both). Not always easy to see. Although isolates with ESBL + impermeability will give false positive results. e) Positive Modified Hodge Test. Please notice: Test only ertapenem resistant strains. Ertapenem susceptible strains may provide a false positive result with Boronic Acid. Conclusion: Reduced susceptibility to ertapenem, synergy between Boronic Acid and the carbapenems, and no synergy between Cloxacillin 500 g and the carbapenems is clearly indicative of KPC enzyme being present. Isolates producing high level AmpC + impermeability can be detected by synergy between Cloxacillin 500 μg and the carbapenems (11). Screening and detection of carbapenemases version C Page 3
4 C) PROCEDURE FOR OXACILLINASE DETECTION (CLASS D ENZYMES) Strains producing oxacillinases will currently show zones of inhibition < 21 mm with Ertapenem and/or <23 mm with Meropenem Neo Sensitabs. Most are resistant to Aztreonam. These enzymes are mainly found in Acinetobacter baumannii but also in Enterobacteriaceae (K. pneumoniae, Enterobacter) and P. aeruginosa although these are rare. INTERPRETATION The following results will presumably indicate the presence of oxacillinases: a) Negative metallo beta lactamase tests. b) Negative (or weak positive) synergy test between clavulanate (AMC) and carbapenems (one or both). c) Positive Modified Hodge Test. (Addition of zinc ions: 70 mg zinc sulphate.h20 /liter medium may be necessary to detect oxacillinases). An isolate is counted positive when it fulfils the 3 criteria MER IM+ED ERT BOR BOR AMC DPA MER ERT CLOX CLOX 10 AMC Screening of carbapenemases IM+ED = Imipenem + EDTA Neo S, MER = Meropenem Neo S, ERT = Ertapenem Neo S, DPA = Dipicolinic Acid Diatabs, AMC = Amoxycillin+Clavulanate Neo S. CLOX = Cloxacillin 500 μg Diatabs With non fermenters use Imipenem Neo S instead of Ertapenem Neo S. Screening and detection of carbapenemases version C Page 4
5 MODIFIED HODGE TEST (MHT) Is used to determine if resistance to carbapenems is caused by a carbapenemase. A MH agar plate (or a McConkey plate) is inoculated with the susceptible strain E. coli ATCC (Mc Farland 0.5, diluted 1/10) as for disk diffusion. When testing Enterobacteriaceae, one Ertapenem Neo Sensitabs and one Meropenem Neo Sensitabs are applied onto the plate approx. 30 mm apart from each other. For non fermenters one Imipenem Neo Sensitabs and one Meropenem Neo Sensitabs are applied. A suspension of the microorganism to be tested for carbapenemase is adjusted to Mc Farland 0.5 standard and a loop is used to make a streak passing through the two carbapenem disks. Two more streaks are placed perpendicularly making a cross. Thereafter incubation for hours at C. Alteration in the shape (indentation) of the zones of inhibition around the test organism is considered indicitive of the presence of a carbapenemase (figure). Ertapenem Meropenem K. pneumoniae KPC positive Modified Hodge Test (MHT) With non fermenters use Imipenem Neo S instead of Ertapenem. Screening and detection of carbapenemases version C Page 5
6 PRODUCTS MENTIONED IN THE BROCHURE INCLUDING REF NO: DIATABS Product code Diatabs Boronic Acid Dipicolinic Acid Cloxacillin 500 μg NEO SENSITABS Product code Original Neo Sensitabs Product code CLSI potency Neo Sensitabs Ertapenem 10 µg Ertapenem 10 µg 80512N Imipenem+EDTA 80512N Imipenem+EDTA Meropenem 10 µg 4312 Meropenem 10 µg 7412 Imipenem 15 µg 1212 Imipenem 10 µg Amoxycillin + Clavulanate ( µg) 0112 Amoxycillin + Clavulanate ( µg) REFERENCES 1) Smith Moland E et al : Newer beta lactamases : Clinical and Laboratory implications.clin Microbiol Newsletter 30, 71 84,2008 2) Kyeong Seob Shin et al : Dipicolinic acid based disk methods for detection of metallo beta lactamase producing Pseudomonas spp and Acinetobacter spp. Diagn Microbiol Infect Dis,2, , ) Soichiro Kimura et al : Evaluation of dipicolinic acid for detection of IMP or VIM type metallo beta lactamase producing P aeruginosa clinical isolates. Diagn Microbiol Infect Dis 53, ,2005 4) Pasteran FG et al : Klebsiella pneumoniae Carbapenemase 2,Buenos Aires,Argentina. Emerg Infect Dis 14, , ) Bradford PA et al: Emergence of carbapenem resistant Klebsiella spp possessing the class A carbapenem hydrolyzing KPC 2 and inhibitor resistant TEM 30 beta lactamases in New York City. Clin Infect Dis 39,55 0,2004. ) Poirel L et al : Carbapenem resistance in A. baumannii : mechanisms and epidemiology. Clin Microbiol Infect 12,82 83,200. 7) Yilmaz M et al : Warning! Oxacillinase mediated carbapenem resistance spreading in Enterobacteriaceae. Presentation P 1517, ECCMID 2008,Barcelona. 8) Cuzon G et al : Plasmid encoded carbapenem hydrolyzing beta lactamase OXA 48 in an Imipenem susceptible K. pneumoniae strain from Belgium. Antimicr Ag. Chemother. 52, , ) Tsakris A. et al: First occurence of KPC-possessing K. Pneumoniae in a Greek hospital and recommendation for detection with Boronic Acid disc tests. J.A.C. 2, , ) Doi Y. et al: Simple disk-based method for detection of K. pneumonia carbapenemase-type beta lactamase by use of a Boronic Acid compound. J.C.M. 4, , ) Giske Chr. : Personal communication, 2009 Page
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