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L. intracellularis-specific IgA in faeces. Faeces samples were collected at the time points indicated and L. intracellularis-specific IgA was measured by ELISA. Values for specific IgA are expressed as OD% of positive control serum/μg total IgA/mg dry faeces of the individual pig from group RE, TC and CC. Arrows indicate inoculation with L. intracellularis at day 0 and at day 49.
