Antigenic relationships of the vaccine A/Victoria/35/72 strain and vaccine candidate A/Khabarovsk/15/76 and recombinant RK-5 strains with hemagglutinins of the epidemic A/Victoria/3/75, A/Leningrad/173/75, and A/Victoria/112/76 strains were studied by radioimmunoassay (RIA) in two test systems. Alongside with other tests RIA is useful and expedient for rapid and accurate quantitative evaluation of the antigenic conformity of influenza virus strains under comparison.
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