Abstract
A double antibody sandwich enzyme-linked immunosorbent assay (ELISA) for the detection of ovalbumin in influenza vaccines has been developed and standardized. Commercially available reagents were used. ELISA was compared to single radial immunodiffusion (SRD) and immunoelectro-osmophoresis (IEOP) techniques. The detection limit by ELISA was 0·5 ng/ml. This method was found to be at least 1000 times more sensitive than SRD and at least 200 times more sensitive than IEOP. It was concluded that ELISA is a specific, sensitive and reproducible method for the determination of the small amounts of ovalbumin found as an impurity in unconcentrated influenza vaccines.
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