Abstract:A comparison of two commercial reversed passive haemagglutination
tests with a counter-immunoelectrophoretic test, used to detect hepatitis-B surface
antigen in reconstituted freeze-dried plasma, showed an increase in the number of
positive results by the haemagglutination tests. No difficulty was encountered with
the appearance of non-specific agglutination provided the plasma was heated at
60°C for 30 min, frozen overnight at -35°C, thawed and centrifuged before testing.
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