In summer 2017, a foodborne outbreak occurred in Central Italy, involving 26 workers employed in the post-earthquake reconstruction. After eating a meal provided by a catering service, they manifested gastrointestinal symptoms; 23 of them were hospitalized. The retrospective cohort study indicated the pasta salad as the most likely vehicle of poisoning. Foods, environmental samples, and food handlers' nasal swabs were collected. () and coagulase-positive staphylococci (CPS) including , together with their toxins, were the targets of the analysis. CPS, detected in all the leftovers, exceeded 10⁵ CFU/g in the pasta salad, in which we found Staphylococcal Enterotoxins (SEs) (0.033 ng SEA/g; 0.052 ng SED/g). None of the environmental and human swabs showed contamination. We characterized 23 from foods. They all belonged to the human biotype, showed the same toxigenic profile (, , , and genes), and had the same Pulsed Field Gel Electrophoresis (PFGE) pattern; none of them harbored or genes. We also detected contamination in the pasta salad but none of the isolates harbored the gene for the emetic toxin cereulide. The EU Reference Laboratory for CPS confirmed the case as a strong-evidence outbreak caused by the ingestion of SEs produced by a single strain of carried by the same human source. This outbreak was successfully investigated despite the emergency situation in which it occurred.
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| http://dx.doi.org/10.3390/toxins10120523 | DOI Listing |
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