Genomic Comparison of Enteritidis Strains Isolated from Laying Hens and Humans in the Abruzzi Region during 2018.

Pathogens

Bacteriology and Diary Production Hygiene department, Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise 'G. Caporale', Campo Boario, 64100 Teramo, Italy.

Published: May 2020

AI Article Synopsis

  • - Salmonellosis, mainly caused by the serovar Enteritidis, has seen a rise in gastroenteritis cases across Europe since 2016, particularly linked to Polish-produced eggs, especially in Italy.
  • - Researchers studied 61 Enteritidis strains from the Abruzzi region in Italy using advanced genetic analysis methods (MLVA and WGS) to find closely related bacterial strains.
  • - They discovered two main genetic clusters: one linked to local farms and human cases with minimal genetic differences, and another related to a dessert sample that matched strains from a wider outbreak associated with Polish eggs.

Article Abstract

Salmonellosis is a major cause of bacterial foodborne infection. Since 2016, an increased number of cases of gastroenteritis caused by serovar Enteritidis linked to eggs produced in Poland has been reported in Europe. In Italy, Enteritidis is one of the three most commonly reported serotypes, associated mainly with the consumption of contaminated eggs and derived products. In our work, we analysed 61 strains of Enteritidis obtained from humans and farms in the Abruzzi region, Italy, in 2018. We used Multiple-Loci Variable-Number Tandem Repeat (VNTR) analysis (MLVA)-based typing and Whole-Genome Sequencing (WGS) tools to identify closely related strains and perform cluster analysis. We found two clusters of genetically similar strains. The first one was present in the local farms and isolated from human cases and had single-linkage distance of no more than two core genes and less than five Single-Nucleotide Polymorphisms (SNPs). The second cluster contained strains isolated from humans and from a dessert (tiramisù) sample that shared identical core genome and were assigned the same SNP address. Cluster 2 isolates were found to be genetically similar to an Enteritidis strain from a multi-country outbreak linked to Polish eggs.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7281747PMC
http://dx.doi.org/10.3390/pathogens9050349DOI Listing

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