Pseudomonas aeruginosa is considered a top priority pathogen associated with elevated morbidity and mortality. Worldwide outbreaks have been associated with a few high-risk epidemic P. aeruginosa lineages. However, the biological features involved in the persistence and spread of such lineages in clinical settings remain to be unravelled. This study reports the emergence of an extensively drug-resistant (XDR) sequence type 309 (ST309) P. aeruginosa in South America (Brazil), specifically in the Amazon region. Genomic analyses were performed with 42 complete and draft ST309 genomes, giving insights into its epidemiology, resistome and mobilome. A heterogeneous distribution of acquired antimicrobial resistance genes among ST309 genomes was observed, which included bla, bla and qnrVC1, all associated with class 1 integrons. Mobilome mining showed the presence of integrative and conjugative elements (ICEs), transposons and genomic islands (GIs) harbouring a huge arsenal of heavy metal resistance determinants, which probably provided adaptive advantages to the ST309 lineage.
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