Desuden blev det konstateret, at den adjuverede vaccine inducerede antistoffer, der krydsbeskyttede mod de H5N1- stammer, som blev isoleret i 2003 og 2004, som udviser antigen drift sammenlignet med de originale stammer.
The adjuvanted vaccine was also found to induce antibodies that cross-protected against the H5N1 strains isolated in 2003 and 2004, which exhibit some antigenic drift compared to the original strains.