VACINAL VECTOR COMPREENDING SALMONELLA ENTÉRICA TYPHIMURIUM ATENUATED MUTANTS FOR THE GENE FIS, VACINA UNDERSTANDING THE VITOR SAYING AND USING THE VITO VITOR

(EN) The development of attenuated live vaccines against salmonellosis has increased over the past years due to the nonexistence of completely effective vaccine formulations which enable different S. enterica serovars to be more effectively controlled. The development of a safe strain that is capable of inducing an efficient immune response involves the production of various attenuated mutants that can be clinically tested or which have unique features that can be combined with other specific mutations, generating increasingly safe and efficient strains. The present invention relates to a vaccine vector comprising mutants for the gene fis, wherein the protein that results from expression thereof, Fis, associates with the bacterial nucleoid regulating the expression of various genes, many of which are related to bacterial pathogenicity. The present invention also relates to a vaccine comprising said mutant strains which generate a response capable of inducing efficient protection against salmonellosis.