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Antibody titers of piglets immunized with the two adjuvanted vaccines. Blood samples were collected before each immunization and before challenge. “Alh vaccine”, “GEL vaccine” and “PBS control” respectively indicate that piglets were subcutaneously immunized with the corresponding vaccine. The E. rhusiopathiae-specific antibody titers in the experimental and control groups were measured with an indirect ELISA and recorded at OD450. The error bars represent the SD.
