A labeled conjugate comprising water-dispersible polymeric particles as a carrier, at least one immunochemical component selected from the group consisting of antigens, haptens, and antibodies, and an enzyme, wherein the immunochemical component and the enzyme are immobilized onto a surface of the carrier, and wherein a total amount of the immunochemical component and the enzyme immobilized is from 5 to 200 mg per 1 g of the water-dispersible polymeric particles on a dry basis; and method for detecting an analyte with the labeled conjugate.
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