Abstract
Summary
Results of determinations of NI and HI antibodies in sera of persons before and after immunization with A2/Aichi/68 and B/Mass/66 influenza viruses are described. A correlation between the magnitude of HI and NI titers was established. Similar results were obtained with inactivated whole virus and virus subunit vaccines. The titer increases resulting from vaccination were, in general, higher for HI than for NI antibodies in accordance with the nonlinear correlation between the two titers.
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