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Background   Acinetobacter baumannii  strains with multiple antimicrobial resistance are primarily known as opportunistic nosocomial bacteria but they may also be regarded as emerging bacterial contaminants of food samples of animal origin. Here we aimed to study the molecular characteristics of the  A. baumanni  strains isolated from raw meat samples.    Methods  A total of 22  A. baumanni  strains were isolated from 126 animal meat samples and were genotyped by ERIC-PCR method and by PCR detection of their virulence and antimicrobial resistance determinants.  A. baumannii  strains with 80% and more similarities were considered as one cluster.    Results  Sixteen different genetic clusters were found amongst the 22  A. baumanni  strains. Of the 22 strains, 12 (54.54%) had similar genetic cluster.  A. baumannii  strains exhibited the highest percentage of resistance against tetracycline (90.90%), trimethoprim (59.09%), cotrimoxazole (54.54%) and gentamicin (50.00%).  TetA  (81.81%),  tetB  (72.72%),  dfrA1  (63.63%),  aac(3)-IV  (63.63%),  sul1  (63.63%) and  aadA1  (45.45%) were the most commonly detected antibiotic resistance genes.  FimH  (81.81%),  afa/draBC  (63.63%),  csgA  (63.63%),  cnf1  (59.09%),  cnf2  (54.54%) and  iutA  (50.00%) were the most commonly detected virulence factors.  A. baumannii  strains isolated from the chicken meat samples had the highest similarities in the genetic cluster.    Conclusions   A. baumannii  strains with similar genetic cluster (ERIC-Type) had the same prevalence of antibiotic resistance, antibiotic resistance genes and virulence factors. Genetic cluster of the  A. baumannii  strains is the main factor affected the similarities in the genotypic and phenotypic properties of the  A. baumannii  strains.

Genotyping and distribution of putative virulence factors and antibiotic resistance genes of Acinetobacter baumannii strains isolated from raw meat