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Secondary standards may represent national standards or working standards that are in routine use at the diagnostic laboratory level. Virus neutralisation; Enzyme-linked immunosorbent assay. The aim of the programme is to harmonise diagnostic testing and encourage the mutual recognition of test results for international trade. Enzyme-linked immunosorbent assay antigen and antibody detection ; Virus neutralisation. Some laboratories may make a charge for this service. Search: Keywords Advanced search.

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