Acinetobacter baumannii isolates from pets and horses in Switzerland: molecular characterization and clinical data

Endimiani, Andrea; Hujer, K.M.; Hujer, A.M.; Bertschy, Isabelle; Rossano, Alexandra; Koch, Christoph; Gerber, Vinzenz; Francey, Thierry; Bonomo, R.A.; Perreten, Vincent (2011). Acinetobacter baumannii isolates from pets and horses in Switzerland: molecular characterization and clinical data. Journal of antimicrobial chemotherapy, 66(10), pp. 2248-2254. Oxford: Oxford University Press 10.1093/jac/dkr289

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OBJECTIVES: We investigated whether Acinetobacter baumannii isolates of veterinary origin shared common molecular characteristics with those described in humans. METHODS: Nineteen A. baumannii isolates collected in pets and horses were analysed. Clonality was studied using repetitive extragenic palindromic PCR (rep-PCR) and multilocus sequence typing (MLST). PCR and DNA sequencing for various beta-lactamase, aminoglycoside-modifying enzyme, gyrA and parC, ISAba1 and IS1133, adeR and adeS of the AdeABC efflux pump, carO porin and class 1/2/3 integron genes were performed. RESULTS: Two main clones [A (n = 8) and B (n = 9)] were observed by rep-PCR. MLST indicated that clone A contained isolates of sequence type (ST) ST12 (international clone II) and clone B contained isolates of ST15 (international clone I). Two isolates of ST10 and ST20 were also noted. Seventeen isolates were resistant to gentamicin, 12 to ciprofloxacin and 3 to carbapenems. Isolates of ST12 carried bla(OXA-66), bla(ADC-25), bla(TEM-1), aacC2 and IS1133. Strains of ST15 possessed bla(OXA-69), bla(ADC-11), bla(TEM-1) and a class 1 integron carrying aacC1 and aadA1. ISAba1 was found upstream of bla(ADC) (one ST10 and one ST12) and/or bla(OXA-66) (seven ST12). Twelve isolates of different STs contained the substitutions Ser83Leu in GyrA and Ser80Leu or Glu84Lys in ParC. Significant disruptions of CarO porin and overexpressed efflux pumps were not observed. The majority of infections were hospital acquired and in animals with predisposing conditions for infection. CONCLUSIONS: STs and the molecular background of resistance observed in our collection have been frequently described in A. baumannii detected in human patients. Animals should be considered as a potential reservoir of multidrug-resistant A. baumannii.

Item Type:

Journal Article (Original Article)


05 Veterinary Medicine > Research Foci > Host-Pathogen Interaction
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > ISME Equine Clinic Bern > ISME Equine Clinic, Internal medicine
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Small Animal Clinic
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Veterinary Bacteriology

UniBE Contributor:

Endimiani, Andrea, Bertschy, Isabelle, Rossano, Alexandra, Koch, Christoph, Gerber, Vinzenz, Francey, Thierry, Perreten, Vincent


600 Technology > 630 Agriculture




Oxford University Press




Factscience Import

Date Deposited:

04 Oct 2013 14:31

Last Modified:

05 Dec 2022 14:10

Publisher DOI:


PubMed ID:




URI: (FactScience: 218295)

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