Steven Glazerman, Larissa Campuzano, Nancy Murray
Education Experiments in Latin America: Empirical Evidence to Guide Evaluation Design
Evaluation review
annual vaccination principal way reduce mortality morbidity associated influenza 20162017 influenza seasons influenza epidemic appeared exhibit different pattern previous years unusual trend incidence influenzalike patients among schoolaged children increased causing doubts effectiveness influenza vaccine therefore study aimed evaluate effectiveness influenza vaccine among elementary school students korea study conducted elementary schools province korea cooperation student health policy division ministry education provincial office education korea except jeju randomly selected one two elementary schools district office education total 2739 elementary school students enrolled vaccination influenza infection status collected subjects parents questionnaires february 13th 21st 2017 vaccine effectiveness defined calculating infection rate influenza among vaccinated unvaccinated groups determining decreased infection rate vaccinated group relative unvaccinated group adjusting time vaccination infection adjusting interval vaccination infection vaccine effectiveness influenza 176 95 confidence interval ci 46 289 225 95 ci 103 33 287 95 ci 175 383 2 weeks 3 weeks 4 weeks vaccination respectively conclusion considering time required adequate immunogenicity 20162017 seasonal influenza vaccine effectiveness korean elementary school students 176287 less effective previous years