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Study groups are indicated on the x axis and densitometric values expressed in arbitrary units (AU) on the y axis. IgM responses to various leptospiral LPS: Autumnalis (A), Australis (B), Ballum (C), Grippotyphosa (D), Pomona (E) are shown. The dashed line represents the cut-off values for each antigens with the absolute cut-off values on the right.
