Análise genética de Salmonella typhimurium ferment adoras de lactose isoladas no Rio de Janeiro

[摘要] Lactose fermenting Salmonella typhimurium are endemic in São Paulo, but not in Rio de Janeiro Two isolations are described from the latter city. These Rio de Janeiro strains have a plasmid of 7.4 megadaltons. These plasmids were not auto-transferable, were thermostable and were not eliminated by acridine orange. One of these strains arose from a plasmid that had the lactose operon repressed, leading us to speculate about the evolution of the lactose fermenting character in Brazilian Salmonella.

[学科分类] 农业科学（综合）

[关键词] Lactose fermenting Salmonella;Salmonella typhimurium Plasmid Epidemiology of Salmonella