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Isolation of Salmonella from cecum after from the ceftiofur groups. No Salmonella vaccine strains were isolated from the cecum of chickens immunized at 3 days after ceftiofur withdrawal. In chicks immunized at other times after withdrawal, the Salmonella vaccine strain could be isolated from the cecum. The Salmonella vaccine strain appears as reddish smooth colonies on Brilliant-Green Phenol-Red Lactose Sucrose medium.
