Review Article

Annals of Microbiology

, Volume 62, Issue 2, pp 449-459

First online:

Commensal gut bacteria: distribution of Enterococcus species and prevalence of Escherichia coli phylogenetic groups in animals and humans in Portugal

  • Nuno SilvaAffiliated withCentre of Studies of Animal and Veterinary Sciences
  • , Gilberto IgrejasAffiliated withInstitute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto DouroDepartment of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro
  • , Alexandre GonçalvesAffiliated withInstitute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto DouroVeterinary Science Department, University of Trás-os-Montes and Alto Douro
  • , Patricia PoetaAffiliated withCentre of Studies of Animal and Veterinary SciencesVeterinary Science Department, University of Trás-os-Montes and Alto Douro Email author 

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Abstract

The gastrointestinal tract is continuously in contact with commensal bacteria that are composed of more than 500 different species, and has an important role in human nutrition and health, by promoting nutrient supply, preventing pathogen colonization and shaping and maintaining normal mucosal immunity. The present review demonstrates the distribution of the intestinal commensal bacteria Enterococcus spp. and the prevalence of Escherichia coli phylogenetic groups in animals and humans in Portugal. The enterococcal population described in this review includes 1,909 enterococcal isolates recovered from a series of fecal samples of different animals (horses, swine, ostriches, partridges, mullet fish, garden dormice, seagulls, pets, poultry, wild boars, birds of prey, and wild rabbits) and healthy and clinical humans. We also compared the phylogenetic groups of Escherichia coli isolates (n = 203) recovered from healthy humans and animals (poultry, ostriches, seagulls, wild boars, birds of prey, and pigs). Phenotypic and molecular analysis allowed the identifying of Enterococcus faecium as the predominant species followed by Enterococcus faecalis. In addition, the Escherichia coli data from different studies showed that isolates of the A and B1 phylogenetic groups are predominant in the gut flora of animal origin and the phylogenetic group B2 isolates were the most common in healthy human samples.

Keywords

Gastrointestinal tract Enterococcus spp. Escherichia coli Portugal