Evaluation of protective immune response against fowl typhoid in chickens vaccinated with the attenuated strain Salmonella Gallinarum ΔcobSΔcbiA - Penha Filho, Rafael Antonio Casarin; Diaz, Silvia Juliana Acelas; Medina, Tiago da Silva; Chang, Yung-Fu; Silva, João Santana da; Berchieri Júnior, Angelo (Research in Veterinary Science, 2016)