Genotypic and phenotypic features of enteropathogenic Escherichia coli isolated in industrialized and developing countries

  • Simona Santona Department of Biomedical Sciences, University of Sassari, Sassari, Italy
  • Nicia Diaz Department of Biomedical Sciences, University of Sassari, Sassari, Italy
  • Pier Luigi Fiori Department of Biomedical Sciences, University of Sassari, Sassari, Italy
  • Moises Francisco Department of Microbiology, University of Luanda, Luanda, Angola
  • Mohsin Sidat Department of Community Health, “E. Mondlane” University, Maputo, Mozambique
  • Piero Cappuccinelli Department of Biomedical Sciences, University of Sassari, Sassari, Italy
  • Paola Rappelli Department of Biomedical Sciences, University of Sassari, Sassari, Italy
Keywords: diarrhoeagenic E. coli, atypical EPEC, Italy, Mozambique, Angola

Abstract

Introduction: Typical EPEC are considered a leading cause of diarrhoea in developing countries, while atypical EPEC have been isolated more frequently in developed areas. The actual geographic distribution of the two EPEC subgroups is controversial, since data can be highly influenced by laboratory resources. This study aimed to compare the distribution of typical and atypical EPEC among children in developed and developing countries, and to characterize the bacterial isolates, using a unique methodological approach.

Methodology: A total of 1,049 E. coli were isolated from faeces of children with acute diarrhoea in Mozambique, Angola and Italy, and processed by PCR to assess the presence of a large panel of virulence genes. All isolates classified as EPEC were further characterized by evaluating adherence and capability to induce actin rearrangement on Hep-2 cells.

Results: Overall we isolated 59 EPEC, likewise distributed in the three countries, representing the 5.04%, 4.44% and 6.97% of all Mozambican, Angolan and Italian isolates, respectively. Nevertheless, the geographic distribution of the two EPEC subgroups was not homogeneous: in Italy we isolated 28 aEPEC but no tEPEC, while in Angola and Mozambique the percentage of the two subgroups was comparable. Twelve atypical EPEC were FAS positive and able to induce localized-like adherence on Hep-2 cells, but no correlation with the geographic origin of isolates was observed.

Conclusion: Atypical EPEC are present in sub-Saharan areas in a percentage similar to that of typical strains, and are not mainly restricted to industrialized countries, as it was previously supposed.

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Published
2013-03-14
How to Cite
1.
Santona S, Diaz N, Fiori PL, Francisco M, Sidat M, Cappuccinelli P, Rappelli P (2013) Genotypic and phenotypic features of enteropathogenic Escherichia coli isolated in industrialized and developing countries. J Infect Dev Ctries 7:214-219. doi: 10.3855/jidc.3054
Section
Original Articles

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