Distribution of virulence genes sefC, pefA and spvC in Salmonella enteritidis phage type 4 strains isolated in Brazil - Castilla, Karina Salvagni; Ferreira, Claudete Serrano Astolfi; Moreno, Andrea Micke; Nunes, Iolanda Aparecida; Ferreira, Antonio José Piantino (Brazilian Journal of Microbiology, 2006)