<qa>  What is the estimated survival probability of a new AMI?Sample size: The combined 1-year primary endpoint of all-cause death, a new AMI or stent thrombosis is estimated at 10.0 expected survival probability of 0.9 for individuals randomized to placebo. With a 5 two-sided significance level the investigators calculated that 386 events would be needed to have a 80 statistical power to detect a 25 reduction of the primary endpoint in the influenza vaccination group, corresponding to a hazard ratio of 0.75. With this estimation 2186 patients are needed per study group, power calculation utilized with STATA release 11 College Station, TX, USA. In order to control for dropouts and crossing from one group to the other both were negligible in TASTE, 4400 patients will be included. 