Article Child 2 Humans child 2 controlled study 2 drug efficacy drug safety 2 human 2 major clinical study 2 school child vaccine 2 Adolescent 1 Adverse Drug Reaction Reporting Systems 1 Aged 1 Asian 1 Black person 1 California 1 Caucasian 1 Child, Preschool 1 Cohort Studies 1 Cross-Sectional Studies 1 Ethnicity 1 Female 1 Hispanic 1 Hospitalizations 1 Infant 1 Infant, Newborn 1 Influenza 1 Influenza Vaccines 1 Influenza, Human 1