METHOD OF PREPARING THE IMPING AGENT AGAINST THE INFLUENZA,CONTAINING THE WEAKENED H3 N2 STRAIN OF INFLENZA VIRUS

摘要

Stable H3N2 influenza virus strains completely resistant to serum inhibitors are obtained by passaging at least one time in the allantoic cavity of embryonated eggs in the presence of serum a recombinant strain previously obtained from an H3N2 influenza strain and the A/PR8 influenza virus strain and isolating the so-obtained serum inhibitors resistant strains. The obtained strains are useful for vaccine production.