Influenza reassortant viruses A/SPb/HK/09(H1N1), A/Astana/HK/2009 (H5N1), A/Otar/HK/2010(H3N8), and A/Perth/ HK/2011(H3N2), carrying surface antigens of different subtypes, were constructed on the basis of new potential unified donor strain A/HK/1/68/162/35(H3N2). The virulence and reproduction activity of the obtained reassortants were tested. The safety of the candidate live and inactivated influenza vaccines produced from the reassortant viruses was demonstrated. The study demonstrates that A/HK/1/68/162/35 can be used as a unified donor for attenuated and high-yield vaccine reassortants.
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