Hindermann, D.

Nordmann, Patrice

Nüesch-Inderbinen, Magdalena

Poirel, Laurent

Stephan, Roger

Zurfluh, Katrin

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Kurzmitteilungen | Short communications457SAT | ASMV 6 | 2016Band 158, Heft 6, Juni 2016, 457–460, © GST | SVSOccurrence and features of chromo-somally encoded carbapenemases in Gram-negative bacteria in farm animals sampled at slaughterhouse levelK. Zurfluh1, D. Hindermann1, M. Nüesch-Inderbinen1, L. Poirel2, P. Nordmann2, R. Stephan11 Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zürich, Switzerland,  2 Emerging Antibiotic Resistance Unit, Medical and Molecular Microbiology, Department of Medicine,  Faculty of Science University of Fribourg, SwitzerlandDOI 10.17236/sat00072Received: 11.01.2016 Accepted: 12.03.2016The emergence and dissemination of carbapenem resist-ance in Gram-negative bacteria, both in fermenters (Enterobacteriaceae) and in non-fermenters (e.g. Acineto­bacter baumannii and Pseudomonas aeruginosa) has been observed since the last years to a large extend. This resist-ance phenotype is often due to the production of carbap-enemases, members of a versatile subset of β-lactamases belonging either to Ambler class A (e.g. KPC), class B metallo-β-lactamases, (e.g. IMP, VIM and NDM) or class D (e.g. OXA-variants), and most often encoded on trans-missible plasmids (Bush, 2013). Carbapenemase-produc-ing bacteria represent an increasing threat to the efficacy of carbapenems such as imipenem, ertapenem or mero-penem, that are  the drugs of choice in human medicine to treat serious infections due to extended-spectrum β-lactamase (ESBL)-producing strains  (Nordmann et al., 2011). Beyond  clinical settings, carbapenem-resistant isolates have been detected in the fecal flora of healthy humans  (Ruppé et al., 2013; Zurfluh et al., 2015a), the aquatic environment (rivers and lakes)  (Zurfluh et al., 2013), vegetables and seafood originating from Asia  (Zur-fluh et al., 2015b; Morrison and Rubin, 2015). Since car-bapenems are not licenced for use in veterinary medicine (at least in Western countries), and a recent survey report-ed the lack of detection of carbapenemase-producing Enterobacteriaceae among farm animals, the risk of ac-quisition of such organisms from food producing animals is considered to be low (Stephan et al. 2013; Poirel et al., 2014). Nevertheless, carbapenemase producers have been isolated from the livestock in Germany and France, in-cluding commensal E. coli producing VIM-1 (Fischer et al., 2012a) and opportunistic, as well as zoonotic patho-gens such as Acinetobacter baumanii producing OXA-23 (Poirel et al., 2012), and Salmonella enterica producing VIM-1 (Fischer et al., 2012b), raising concerns about the possibility of transmission via food-producing animals. The main focus of antibiotic resistance monitoring is on plasmid-encoded carbapenemases. However, carbapene-mases were originally described as species-specific, chro-mosomally encoded β-lactamases (Queenan and Bush, 2007), and environmental strains have repeatedly been identified as reservoirs for progenitors of globally dissem-inating plasmid-encoded carbapenemases. For example, Acinetobacter radioresistens has been identified as the source of a chromosomal blaOXA-23-like gene, which is currently widespread as a plasmid-encoded blaOXA-23 in Acinetobacter baumannii (Poirel et al., 2008). Further, Schewa nella xiamenensis harbours a chromosomal blaOXA-181, which has been detected on plasmids in other species e.g. in clinical isolates of Klebsiella pneumoniae and in Klebsiella variicola isolated from food (Potron et al., 2011; Zurfluh et al., 2015). The aim of this study was to screen for the presence of carbapenemases, including naturally occurring variants, in Gram-negative bacteria in fecal samples of food-producing animals at slaughter-house level in Switzerland, using the SUPERCARBA II selective medium (Nordmann et al., 2012). SamplingFecal samples from 83 pigs (70 fattening pigs, 12 sows and 1 boar) as well as 160 cattle (11 calves, 36 cattle, 46 cows and 67 bulls) were collected in December 2014 and January 2015 from healthy food-producing animals at two major abattoirs in Switzerland. To prevent dupli-cate isolation, no more than 3 samples per livestock per slaughtering batch were collected. The providing farms were geographically distributed throughout Switzerland. Samples were taken from the jejunum part of the intes-tine with sterile swabs, placed in stomacher bags and processed on the same day.457_460_Zurfluh.indd   457 25.05.16   10:49Kurzmitteilungen | Short communications458 SAT | ASMV 6 | 2016 Band 158, Heft 6, Juni 2016, 457–460, © GST | SVSOccurrence and features of chromosomally en-coded carbapenemases in Gram-negative bacteria in farm animals sampled at slaughterhouse levelK. Zurfluh et al.Microbiological analysisEach sample was mixed in a stomacher machine with 10 ml of E.E. broth (Ltd, Basingstoke, Hampshire, Eng-land) and incubated at 37 °C for 24 hours for enrich-ment. The enriched samples (10 μl) were inoculated onto SUPERCARBA II medium selecting for bacteria with reduced susceptibility to ertapenem (Nordmann et al., 2012; Zurfluh et al., 2015a)  and incubated at 37 °C for 24 hours under aerobic conditions. Resulting colonies were subcultured on TSI agar (DifcoTM, Becton Dickin-son AG, Allschwil, Switzerland) and carbapenemase production was confirmed using the RAPIDEC® CARBA NP test (bioMérieux Ltd, Geneva, Switzerland), according to the manufacturer's instructions. Species identification was performed by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (Mabritec AG, Riehen, Switzerland). Antimicrobial susceptibility testing was performed using the Kirby Bauer disk diffusion method and the antibiotics ampicillin, amoxicillin/clavulanic acid, cephalotin, cefotaxime, nalidixic acid, ciprofloxacin, azithromycin, gentamicin, kanamycin, streptomycin, tetracycline, sulfamethoxazole, trimethoprim and chlo-ramphenicol (Becton Dickinson, Heidelberg, Germa-ny). Results were interpreted according to the Clinical and Laboratory Standards Institute (CLSI, 2011).Identification of carbapenemase genes DNA was extracted by a standard heat lysis protocol. Thereafter, isolates were screened for the presence of the carbapenemase genes blaKPC, blaVIM, blaNDM and blaOXA-48 by PCR using primers (custom-synthesized by Microsynth, Balgach, Switzerland) and conditions de-scribed previously (Ellington et al., 2007; Poirel et al., 2011). Aeromonas veronii isolates were tested for the imiS gene using primers described earlier (Sánchez-Céspedes et al., 2009). The Pseudomonas alcaligenes isolate was ana-lyzed for the presence of blaPAM-1 (Suzuki et al., 2014) using the newly designed primers PAM-1F 5'-CGT TTC CTC GCC AGC CTC G-3' and PAM-1R 5'-CGC GAC TTT GCC TGC TCG-3'. The Stenotrophomonas malto­philia isolate was tested for blaL1 and blaL2 with primers published previously (Avison et al., 2001). Amplicons were visualized by electrophoresis with 1% agarose gels stained with ethidium bromide under ultraviolet light.Results and DiscussionFecal samples of 83 pigs and 160 cattle were investigated for the presence of carbapenemase producers. Two (2.4%) samples from pigs and 27 (16.9%) from cattle produced growth on the modified SUPERCARBA II agar medium. Subcultured colonies were subjected to the RAPIDEC® CARBA NP test to confirm for carbap-enemase production. Thereafter, seven isolates, all from cattle, were retained for further analysis. Phenotypic resistance of the remaining 22 RAPIDEC-negative iso-lates was attributed to synergistic mechanisms such as hyperexpression of β-lactamase combined with modifi-cations of outer membrane proteins (OMPs) and not subjected to further analysis. Species identification and PCR screening of the carbapenemase producers revealed five A. veronii harbouring blaImiS, one P. alcaligenes con-taining blaPAM-1 and one S. maltophilia containing blaL1 and blaL2 (Tab. 1). None of the isolates harboured ac-quired carbapenemase genes such as blaKPC, blaVIM, blaNDM or blaOXA-48, thereby confirming a previous re-port on the absence of isolates harbouring transmissible carbapenemase genes in Swiss livestock (Stephan et al., 2013). The resistance phenotypes of the isolates are sum-marized in Table 1. Our survey shows that carbapene-mase producers may be isolated from food producing animals. The detected isolates were neither indicators of resistance, nor common food-borne pathogens (e.g. E. coli or Salmonella spp.) and therefore would not have been identified by current surveillance programs. Rather, they represent ubiquitous, opportunistically pathogenic bacteria. Nevertheless, in particular A. vero­nii has been implicated in a broad range of human in-fections, predominantly biliary tract infections and secondary bacteraemia (Figueras, 2005). In this species, carbapenem resistance is due to chromosomally-encod-ed blaimiS, which is known to be co-transcribed with other chromosomally located β-lactamases with overex-pression induced in the presence of β-lactam or carbap-enem antibiotics (Walsh et al., 1995). Hence, the use of penicillins or penicillin-β-lactamase inhibitor combina-tions in veterinary medicine could create selective pres-sure for naturally occurring chromosomal carbapene-mases, which, in theory, could eventually be mobilised Table 1: Strain identities, carbapenemases and antimicrobial resistance profiles of Gram-negative bacteria isolated from cattle at slaughterhouse level in Switzerland.Strain ID Species Carbapenemase Resistance profileS158 Aeromonas veronii ImiS AM S194 Aeromonas veronii ImiS AMS296 Aeromonas veronii ImiS AMS300 Aeromonas veronii ImiS AM, NA, SS308 Aeromonas veronii ImiS AM, AMC, TES173 Pseudomonas  alcaligenesPAM-1 AM, AMC, CF, CTX, S S164 Stenotrophomonas maltophiliaL1, L2 AM, AMC, CF, CTX, GM, S, TMPAbbreviations: AM, ampicillin; AMC, amoxicillin clavulanic acid; CF, cephalothin;  CTX, cefotaxime; GM, gentamicin; NA, nalidixic acid; TE, tetracycline; TMP, trimethoprim; S, streptomycin.457_460_Zurfluh.indd   458 25.05.16   10:49Kurzmitteilungen | Short communications459SAT | ASMV 6 | 2016Band 158, Heft 6, Juni 2016, 457–460, © GST | SVSOccurrence and features of chromosomally en-coded carbapenemases  in Gram-negative bacteria in farm animals sampled at slaughterhouse levelK. Zurfluh et al.and disseminated by genetic elements (EFSA Panel on Biological Hazards (BIOHAZ), 2013). Veterinary and human clinicians need to be aware of the fact that treatment of animals and humans with β-lactam anti-microbials may be associated with the emergence of carbapenem resistant A. veronii, possibly representing a threat to human health, if disseminated from animals to humans. With regard to meat processing, it is of par-ticular interest that Aeromonas spp. have the ability to grow at 4 °C as well as anaerobically. Food preservation techniques such as cooling and vacuum packing may facilitate the growth of Aeromonas spp. (Ørmen and Østensvik, 2001). This study shows that this species represents, together with other Gram-negative bacteria such as P. alcaligenes or S. maltophilia, a reservoir for carbapenemase genes in the fecal flora of food produc-ing animals. AcknowledgementsWe would like to thank the staff of the abattoir for their assistance with sample collection.ReferencesAvison M. B., Higgins C. S., von Heldreich C. J., Bennett P. M., Walsh T. R.: Plasmid location and molecular heterogeneity of the L1 and L2 beta-lactamase genes of Stenotropho-monas maltophilia. Antimicrob. Agents. Chemother. 2001, 45: 413–419.Bush K.: Proliferation and significance of clinically relevant β-lactamases. Ann. N. Y. Acad. Sci. 2013, 1277: 84–90.Clinical and Laboratory Standards Institute: Performance standards for antimicrobial susceptibility testing; Twen-ty-first informational supplement. CLSI document M100-S21 2008, Wayne, 2011. European Food Safety Authority (EFSA) Panel on Biological Hazards (BIOHAZ): Scientific Opinion on the risk posed by pathogens in food of non-animal origin. EFSA. Journal. 2013, 11(1): 3025.Ellington M. J., Kistler J., Livermore D. M., Woodford N.: Multiplex PCR for rapid detection of genes encoding ac-quired metallo-β-lactamases. J. Antimicrob. Chemother. 2007, 59: 321–322.Figueras M.J.: Clinical relevance of Aeromonas sM503. Rev. Med. Microbiol. 2005, 16: 145–153.Fischer J., Rodríguez I., Schmoger S., Friese A., Roesler U., Helmuth R., Guerra B.: Escherichia coli producing VIM-1 car-bapenemase isolated on a pig farm. J. Antimicrob. Chem-other. 2012, 67: 1793–1795.Fischer J., Rodríguez I., Schmoger S., Friese A., Roesler U., Helmuth R., Guerra B.: Salmonella enterica subsp. enterica producing VIM-1 carbapenemase isolated from livestock farms. J. Antimicrob. Chemother. 2012, 68: 478–480.Morrison B. J., Rubin J. E.: Carbapenemase producing bac-teria in the food supply escaping detection. PLoS. One. 2015, 10: e0126717.Nordmann P., Girlich D., Poirel L.: Detection of carbapene-mase producers in Enterobacteriaceae by use of a novel screening medium. J. Clin. 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Antimicrob. Resist. Infect. Control. 2015, 4: 38.Corresponding authorProf. Dr. med. vet., Dr. h.c. Roger Stephan Institute for Food Safety and Hygiene Vetsuisse Faculty University of Zurich Winterthurerstrasse 272 CH-8057 Zurich Switzerland Phone: +41 44 635 86 51 Fax: +41 44 635 89 08 E-Mail: stephanr@fsafety.uzh.ch.457_460_Zurfluh.indd   460 25.05.16   10:49

Occurrence and features of chromosomally encoded carbapenemases in Gram-negative bacteria in farm animals sampled at slaughterhouse level

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