title: Morbidity by upper respiratory tract diseases in a semi-closed community, after intranasal application of an inactivated influenza vaccine.
mesh_terms: D006801:Humans; D007252:Influenza Vaccines; D012140:Respiratory Tract Diseases / Q000453:epidemiology* / Q000276:immunology / Q000517:prevention & control; D012383:Romania
chemical_list: D007252:Influenza Vaccines