Methods Design: Cluster randomized controlled trial. ClinicalTrials.gov

adolescents decreased influenza infection in nonvaccinated community members Loeb M, Russell ML, Moss L, et al. Effect of influenza vaccination of children on infection rates in Hutterite communities: a randomized trial. JAMA. 2010;303:943-50. Question Does influenza vaccination of children and adolescents reduce risk for influenza infection in nonrecipient community residents