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Anti-Salmonella IgG antibodies in the serum of S. enterica serovar Typhimurium-infected mice that received no further treatment (○), received total-body irradiation (▪), or were depleted of CD4+ T cells (▴). The titer was defined as the dilution for which the optical density at 450 (OD450) of the sample was more than the OD450 of the naïve serum plus 2 standard deviations.
