The present Invention relates to a Mutant Strain of Salmonella enteritidis 3934vac comprising a Gene deletion Waal. Also refers to a procedure for Generating the Mutant Strain of Salmonella enteritidis Vaccine and a recombinant Avian 3934vac comprising the Mutant StrainLa presente invencion se refiere a una cepa mutante de Salmonella enteritidis 3934vac que comprende una delecion del gen waal. Ademas se refiere a un procedimiento para generar dicha cepa mutante de Salmonella enteritidis 3934vac y una vacuna recombinante aviar que comprende dicha cepa mutante