reassortant influenza a viruses with high growth capacity in eggs and suitable as candidate vaccine strains or as standard reagents for influenza ha quantification were prepared using the high yielding a/pr/8/34 ( h1n1 ) as one parent and a number of 'wild ' strains of influenza a ( h1n1 ) or ( h3n2 ) viruses as the other parent .
C0021400
influenza
C2076600
influenza