S49 New Challenges for the Control of Influenza S49-1 Approach from the aspect of glycovirology S49-2 Control of influenza virus based on functional structures S49-3 Function of pandemic influenza virus neuraminidase S49-4 Influenza Virus: Prediction of Antigenic Change and Potential of Heterosubtypic Immunity S49-5 Present status and problems of new influenza vaccine S49-6 CTL-based influenza vaccine