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Global transmission and antibiotic resistance dynamics of Staphylococcus aureus CC398 in humans and livestock revealed by whole genome sequence analysis

ABSTRACT: Staphylococcus aureus CC398 in humans and livestock

PROVIDER: PRJEB7209 | ENA |

REPOSITORIES: ENA

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Staphylococcus aureus CC398 Clade Associated with Human-to-Human Transmission

Project description:Staphylococcus aureus clonal complex 398 (CC398) isolates colonize livestock and can spread to human contacts. Genetic analysis of isolates epidemiologically associated with human-to-human, but not livestock, transmission in multiple countries and continents identified a common clade that was negative for tet(M) and positive for bacteriophage 3. Another group of human-to-human-transmitted isolates belonged to the common livestock-associated clade but had acquired a unique φ7 bacteriophage. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-124]

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The distribution of mobile genetic elements (MGEs) in MRSA CC398 is associated with both host and country.

Project description:Methicillin-resistant Staphylococcus aureus clonal complex (CC) 398 has emerged from pigs to cause human infections in Europe and North America. We used a new 62-strain S. aureus microarray (SAM-62) to compare genomes of isolates from three geographical areas (Belgium, Denmark, and Netherlands) to understand how CC398 colonizes different mammalian hosts. The core genomes of 44 pig isolates and 32 isolates from humans did not vary. However, mobile genetic element (MGE) distribution was variable including SCCmec. Phi3 bacteriophage and human specificity genes (chp, sak, scn) were found in invasive human but not pig isolates. SaPI5 and putative ruminant specificity gene variants (vwb and scn) were common but not pig specific. Virulence and resistance gene carriage was host associated but country specific. We conclude MGE exchange is frequent in CC398 and greatest among populations in close contact. This feature may help determine epidemiological associations among isolates of the same lineage. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-120]

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