Virulence characteristics of Escherichia coli isolates obtained from broiler breeders with salpingitis - Monroy, Maria Antonia Rincon; Knöbl, Terezinha; Bottino, José Américo; Astolfi-Ferreira, Claudete Serraro; Ferreira, Antonio José Piantino (Comparative Immunology Microbiology and Infectious Diseases, 2005)