Disclosed is a kit when used to prepare an immunogenic composition at the point of use or within 12 hours before use of said immunogenic composition, said kit comprising: (i) an antigen component, comprising an influenza virus antigen and (ii) an adjuvant component, comprising an aluminium salt, wherein the antigen component and the adjuvant component are separate, and wherein the immunogenic composition is prepared by mixing of the antigen component and the adjuvant component at the point of use or within 12 hours before use. Also disclosed is a process for preparing an influenza vaccine, comprising the steps of: (i) preparing an antigen component comprising an influenza virus antigen (ii) preparing an adjuvant component comprising an aluminium salt and (iii) combining the antigen and adjuvant components at the point of use, or within 12 hours of use of said influenza vaccine.
