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Background  The aim of our study was to investigate the possible etiology of avian colibacillosis by examining  Escherichia coli  isolates from fecal samples of healthy broilers.    Findings  Seventy-eight  E. coli  isolates from fecal samples of healthy broilers in Japan were subjected to analysis of phylogenetic background, virulence-associated gene profiling, multi-locus sequence typing (MLST), and antimicrobial resistance profiling. Phylogenetic analysis demonstrated that 35 of the 78 isolates belonged to group A, 28 to group B1, one to group B2, and 14 to group D. Virulence-associated genes  iutA ,  iss ,  cvaC ,  tsh ,  iroN ,  ompT , and  hlyF  were found in 23 isolates (29.5%), 16 isolates (20.5%), nine isolates (11.5%), five isolates (6.4%), 19 isolates (24.4%), 23 isolates (29.5%), and 22 isolates (28.2%) respectively. Although the genetic diversity of group D isolates was revealed by MLST, the group D isolates harbored  iutA  (10 isolates, 71.4%),  iss  (6 isolates, 42.9%),  cvaC  (5 isolates, 35.7%),  tsh  (3 isolates, 21.4%),  hlyF  (9 isolates, 64.3%),  iroN  (7 isolates, 50.0%), and  ompT  (9 isolates, 64.3%).    Conclusions  Our results indicated that  E. coli  isolates inhabiting the intestines of healthy broilers pose a potential risk of causing avian colibacillosis.

irish veterinary journal

Phylogenetic grouping, epidemiological typing, analysis of virulence genes, and antimicrobial susceptibility of Escherichia coli isolated from healthy broilers in Japan