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These characteristics differ significantly in methicillin resistant (MRSA) and methicillin sensitive <jats:italic>S. aureus<\/jats:italic> (MSSA) and also among isolates of different MRSA clones, contributing to the outcome of <jats:italic>S. aureus<\/jats:italic> bacteraemia.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>In this study, all MRSA BSI isolates from Semmelweis University, Budapest, Hungary, isolated between 2011\u20132016 and the same number of matched MSSA (overall 306 isolates) were characterised in terms of antibiotic susceptibility, virulence genes, clonality and their association with all-cause 30-day mortality. Effect of patient related variables, such as age, gender and comorbidities were also investigated.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>ST22-MRSA-IV and ST5-MRSA-II were the most prevalent clones in our study. SCC<jats:italic>mec<\/jats:italic> I isolates showed the highest resistance rates and SCC<jats:italic>mec<\/jats:italic> II carried most virulence genes. Infections caused by SCC<jats:italic>mec<\/jats:italic> IV isolates were associated with the highest mortality rate (42.2%), despite the similar comorbidity rates of the different patient groups. All-cause 30-day mortality was 39.9% in the MRSA and 30.7% in the MSSA group. Increased teicoplanin MIC was associated with high mortality rate. Resistance to ciprofloxacin, erythromycin and clindamycin was common in MRSA, whereas MSSA isolates were more sensitive to all antibiotics with the exception of doxycycline. All MRSA isolates were sensitive to glycopeptides and linezolid; resistance to rifampicin and sulfamethoxazole-trimethoprim was low. MRSA isolates carried more adhesion genes, superantigens were more frequent in MSSA. Panton-Valentine leukocidin was found in 2.3% of the isolates.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusion<\/jats:title>\n<jats:p>This study provides insight into the clonal composition and associated mortality of BSI <jats:italic>S. aureus<\/jats:italic> isolates in Hungary. The results suggest that the outcome of the infection is determined by the antibiotic resistance, genotype of the bacterium, and patient-related factors; rather than the virulence factors carried by the bacteria.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s12941-020-00357-z","type":"journal-article","created":{"date-parts":[[2020,5,7]],"date-time":"2020-05-07T14:02:47Z","timestamp":1588860167000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Characterisation of antibiotic resistance, virulence, clonality and mortality in MRSA and MSSA bloodstream infections at a tertiary-level hospital in Hungary: a 6-year retrospective study"],"prefix":"10.1186","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4208-3417","authenticated-orcid":false,"given":"Andrea","family":"Horv\u00e1th","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Orsolya","family":"Dobay","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Judit","family":"Sahin-T\u00f3th","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emese","family":"Juh\u00e1sz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00falia","family":"Pongr\u00e1cz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mikl\u00f3s","family":"Iv\u00e1n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enik\u0151","family":"Fazakas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katalin","family":"Krist\u00f3f","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,5,7]]},"reference":[{"issue":"4","key":"357_CR1","doi-asserted-by":"publisher","first-page":"e00020-18","DOI":"10.1128\/CMR.00020-18","volume":"31","author":"S Lakhundi","year":"2018","unstructured":"Lakhundi S, Zhang K. 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