Polyphasic characterization of Salmonella Enteritidis isolates on persistently contaminated layer farms during the implementation of a national control program with obligatory vaccination: a longitudinal study34033, Dewaele, I., Rasschaert G., Wildemauwe C., Van Meirhaeghe H.;, Vanrobaeys M., De Graef E., Rman L., Ducatelle R., Yndrickx M., and Reu K. , Poult.Sci., 0/11/2012, Volume 91, Issue 11, Number 2735, p.2727 - 2735, (2012)