Abstract
Multidrug resistance, due to acquired antimicrobial resistance genes, is increasingly reported in the zoonotic pathogen Streptococcus suis. Most of these resistance genes are carried by chromosomal Mobile Genetic Elements (MGEs), in particular, Integrative and Conjugative Elements (ICEs) and Integrative and Mobilizable Elements (IMEs). ICEs and IMEs frequently form tandems or nested composite elements, which make their identification difficult. To evaluate their mobility, it is necessary to (i) select the suitable donor-recipient pairs for mating assays, (ii) do PCR excision tests to confirm that the genetic element is able to excise from the chromosome as a circular intermediate, and (iii) evaluate the transfer of the genetic element by conjugation by doing mating assays. In addition to a dissemination of resistance genes between S. suis strains, MGEs can lead to a spreading of resistance genes in the environment and toward pathogenic bacteria. This propagation had to be considered in a One Health perspective.
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