Figure 1From: Development and validation of an enzyme-linked immunosorbent assay for antibodies against Mycobacterium bovisin european wild boar Increase rate (S2/S1) in the optical density reading of the ELISA with bovine PPD and protein G in WB1 and WB4 (immunized with M. bovis ), WB2 ( M. avium paratuberculosis ) and WB3 ( M. avium ). Back to article page