Abstract
The methicillin-resistant Staphylococcus aureus (MRSA) sequence type (ST) 8 Panton-Valentine toxin (PVL)-positive USA300 clone has a worldwide distribution. The USA300 North American (NA) variant, harbouring the arginine catabolic mobile element (ACME), is predominant in the USA while the Latin American (LV) variant is predominant in Northern South America. Both variants have failed to become endemic in Europe. We examined here the epidemiology of the USA300 clone in Belgium from 2006 to 2019. A total of 399 clonal complex 8 PVL-positive MRSA isolates received between 2006 and 2019 by the Belgian National Reference Laboratory for S. aureus were investigated for the presence of ACME. Selected ACME-positive (n=102) and ACME-negative (n=16) isolates were sequenced, characterized for the presence of several resistance and virulence molecular markers and subjected to phylogenetic analysis. A total of 300 isolates were USA300-NA (ACME-positive), while only 99 were ACME-negative. Most USA300-NA interspersed in the phylogeny analysis with isolates from other countries, suggesting multiple introductions. However, two big clades were maintained and spread over a decade, peaking between 2010 and 2017 to finally decrease. Few ACME-negative isolates, mainly related to trips to South America, were identified as USA300-LV. The remaining ACME-negative isolates were ST8 SCCmec IVb or ST923 SCCmec IVa (COL923). Two clades of the USA300-NA clone have successfully spread in Belgium, but seem to currently decrease. Related South American variants have been detected for the first time in Belgium, including the emerging COL923 clone.
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Acknowledgements
We thank Raf De Ryck, Pascal Buidin, Geneviève Hay, Nathalie Legros and Christine Thiroux for technical assistance. We thank our microbiologist colleagues for sending their staphylococcal strains to the NRC and the technicians of the service Transversal activities in Applied Genomics at Sciensano for performing the WGS.
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This work was supported by the LHUB-ULB (no. project 485951501).
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MAA conceived the idea and analyzed the epidemiological and NGS data. MAA, AD, CN, NY, CM, DM and MH work(ed) at the Belgian National Reference Centre of Staphylococci and therefore contributed in the generation and validation of the epidemiological data. SCJDK obtained the NGS data. MAA wrote the manuscript in consultation with MH with input from the remaining authors.
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Table S1-S4.
PCR, antimicrobial resistance and CGE results of the CC8 PVL-positive isolates recovered at the NRLS. Table S2. PCR, antimicrobial resistance and CGE results of the Belgian CC8 PVL-negative isolates used as outgroup. Table S3. Global ST8 collection used in the wgSNPs analysis. Table S4. Genes and regions investigated by using MyDbFinder (CGE). (XLSX 141 kb)
Figure S1.
Minimum spanning tree of CC8 Belgian isolates (n=138) based on 4546 wgSNPs. The genome of the USA300-NA TCH1516 (accession number: NC_010079) strain (in red) was used as reference genome. (PPTX 167 kb)
Figure S2.
Heatmap [clustering method: complete linkage, distance measurement method: Pearson correlation coefficient (between 0 and 1)] of presence/absence of genes by isolate. Genes and region used in the classification of isolates (SCCmec, ACME, COMER), as well as genes present in all isolates investigated by WGS were omitted. Black colour indicates presence of gene(s). FQR-NA, fluoroquinolone resistant USA300-NA isolates; FQS-NA; fluoroquinolone susceptible USA300-NA isolates; NA-AN, USA300-NA ACME-negative; LV, USA300-LV isolates; ST8-IVb, ST8 SCCmec IVb isolates; ST923, ST923 SCCmec IVa isolates. (PPTX 396 kb)
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Argudín, M.A., Deplano, A., Nonhoff, C. et al. Epidemiology of the Staphylococcus aureus CA-MRSA USA300 in Belgium. Eur J Clin Microbiol Infect Dis 40, 2335–2347 (2021). https://doi.org/10.1007/s10096-021-04286-3
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DOI: https://doi.org/10.1007/s10096-021-04286-3