Genetic Relatedness and Diversity of from Different Reservoirs: Humans and Animals of Livestock, Poultry, Zoo, and Aquaculture.

Microorganisms

National Reference Laboratory of Antibiotic Resistances and Healthcare Associated Infections (NRL-AMR-HAI), Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, 1649-016 Lisbon, Portugal.

Published: September 2020

The main aim of this study was the characterization of antibiotic resistance mechanisms in 82 strains isolated from humans and animals. Antibiotic susceptibility testing was performed on all isolates accordingly, and antibiotic-resistant genes were investigated by genotypic methods. The genetic diversity of was studied through , multilocus sequence typing (MLST), and typing methods. The majority of from human sources were resistant to cefoxitin (and harbor the gene) and fluoroquinolones, whereas only four strains of from animal sources revealed resistance to ciprofloxacin. In the set of isolated from humans, the most frequent , MLST, and group were t032, ST22, and I, respectively. In strains from animal origin the most common , MLST, and group found were t2383, ST398, and III/not typable, respectively. from humans and animals were identified either in clonal complexes CC5, CC30, and CC398, suggesting that they have the same putative founder in their evolution. Considering the three CCs encompassing strains from human and animal reservoirs with different -types, we can hypothesize that this might reflect an adaptation to different phylogenetic lineages in those reservoirs (host species) probably associated to genetic diversification of pre-existing strains.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7564200PMC
http://dx.doi.org/10.3390/microorganisms8091345DOI Listing

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