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RESEARCH PRODUCT

Antibiotic Resistance Profiling, Analysis of Virulence Aspects and Molecular Genotyping of Staphylococcus aureus Isolated in Sicily, Italy

Salvatore GaglioChiara PirainoVincenzo Di Marco Lo PrestiGiuseppe CasconeMaria VitaleRosa AlduinaPaola Galluzzo

subject

0301 basic medicineStaphylococcus aureusLivestockantibiotic resistanceGenotypeMLST; MRSA; PFGE; Staphylococcus aureus; antibiotic resistance; toxin genesTetracycline030106 microbiologyVirulenceMRSABiologymedicine.disease_causeSettore BIO/19 - Microbiologia GeneraleApplied Microbiology and BiotechnologyMicrobiologyMicrobiologyFoodborne DiseasesEnterotoxins03 medical and health sciencesAntibiotic resistanceDrug Resistance BacterialPulsed-field gel electrophoresismedicineAnimalsHumansSicilyRetrospective StudiesVirulenceOutbreakOriginal ArticlesPFGEStaphylococcal InfectionsAnti-Bacterial AgentsBacterial Typing TechniquesElectrophoresis Gel Pulsed-FieldPenicillin030104 developmental biologyStaphylococcus aureustoxin genesStaphylococcus aureuFood MicrobiologyMultilocus sequence typingAnimal Science and ZoologyMultilocus Sequence TypingMLSTFood Sciencemedicine.drug

description

Abstract Staphylococcus aureus is the major cause of foodborne diseases worldwide. In this retrospective study, 84 S. aureus strains were characterized. The collection comprises 78 strains isolated during 1998 and 2014 from dairy products and tissue samples from livestock bred for dairy production in Sicily. One isolate was obtained from a pet (dog), one from an exotic animal (a circus elephant), and four human isolates were obtained during a severe food poisoning outbreak that occurred in Sicily in 2015. All the strains were characterized by pulsed-field gel electrophoresis (PFGE), for antibiotic resistance and presence of toxin genes. PFGE results showed 10 different pulsotypes, with three relatively frequent and three unique. The antibiotic resistance profiling showed that penicillin G (35.7%) and tetracycline (20.2%) resistance is largely spread. Most isolates contained at least one toxin gene making them a potential threat for public health. Enterotoxin sec gene was observed in 28.6% and seg in 23.8% of the strains, respectively; the human isolates were the only ones to concurrently harbor both seg and sei genes. In addition, 24 isolates were randomly selected and analyzed by multilocus sequence typing. Interestingly, the analysis showed the presence of 12 sequence types (STs), of which 6 were novel. One of them, ST700, was detected in 29% of the isolates and was found to be spread throughout Sicily. ST700 has been present in the island for almost 16 years (1998–2014) and it shows no host preference since it was isolated from different ruminant species. Four human isolates shared both the pulsotype (PT10) and the sequence type (ST9), as well as the virulence genes (seg-sei); this observation suggests that the isolates originated from a single clone, although they were obtained from two different individuals.

yearjournalcountryeditionlanguage
2018-01-01
10.1089/fpd.2017.2338http://hdl.handle.net/10447/252339