Abstract
Summary
Significant enhancement of hemagglutination titers of unfractionated measles virus pools by salts such as (NH4)2SO4 is reported. Extent of titer increase varies with the ratio of enhanceable hemagglutinins to non-enhanceable hemagglutinins in a preparation. This ratio can be favorably altered by sonication, so that most, if not all, measles pools can be used to advantage in hemagglutination-inhibition tests incorporating increased amounts of salts. Properties of measles hemagglutinins classified according to their specific salt requirements are compared and discussed.
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