Molecular characterization of infectious bronchitis virus strains isolated from the enteric contents of Brazilian laying hens and broilers - Villarreal Buitrago, Laura Yaneth; Brandão, Paulo Eduardo; Chacón, Jorge Luis; Saidenberg, A. B. S; Assayag, M. S; Jones, R. C; Ferreira, Antonio José Piantino (Avian Diseases, 2007)