An example of evolutive engineering in bacterial pathogens is the emergence of hybrid virulence-resistance (VR) plasmids in Salmonella enterica, resulting from an association between antimicrobial resistance determinants and specific virulence plasmids of the S. typhimurium and S. choleraesuis serotypes. VR plasmids all possess the spv (Salmonella plasmid virulence) operon, which is involved in systemic infection; however, they differ in the presence of other virulence determinants and in the resistance gene profile. VR plasmids of S. typhimurium have been found in Europe, and show resistance regions with different levels of complexity that can include class 1 integrons and various transposons. VR plasmids of S. choleraesuis, detected in strains isolated in Taiwan, only confer resistance to ampicillin and sulfonamides. Both serotypes are zoonotic and the presence of hybrid VR plasmids may confer an adaptive advantage under certain conditions, resulting in bacterial strains that are more difficult to treat and have a higher epidemic potential.
[Evolutionary engineering in Salmonella: emergence of hybrid virulence-resistance plasmids in non-typhoid serotypes]
살모넬라의 진화 공학: 비장티푸스 혈청형에서 하이브리드 독성-저항성 플라스미드의 출현
[Category] 살모넬라증, 조류인플루엔자,
[Article Type] Review
[Source] pubmed
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