[Manifestations of influenza-virus variability during its cultivation in the system of passively immunized chick embryos].


A method of immunological actions on the influenza virus in the system of chick embryos passively immunized with isologous sera was elaborated. With the aid of the suggested method it was possible to induce in strains (with different hemagglutinin type and different degree of attenuation) the transformation of signs characterizing the virus variability in… (More)