Do you have a healthy child 6 months - 13 years old? or Are you a healthy adult 18 - 49 years old? Would you or your child like to participate in a research study of the immune response to the seasonal flu vaccine? Your support could possibly lead to development of more effective vaccines. Each participant will receive the current FDA-licensed flu vaccine and $30 compensation for each of the 2-4 clinic visits completed. Blood samples and/or nasal swabs may be collected at some visits. For more information contact: Stanford-LPCH Vaccine Program 650-498-7284 vaccines_program@stanford.edu http://vaccines.stanford.edu/clinical_trials.html For general information about research participant rights, contact 1-866-680-2906