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ELISA results for 33 US Marine sera with different antigens. IgG (a) and IgM (b) in patient sera specific for Com1 (square), whole cell phase I (triangle), and whole cell phase II (circle) were measured. (Amp): amplified ELISA. WC I: phase I whole cell antigen, WC II: phase II whole cell antigen. O.D., optical density.
