title: Preliminary data on the efficiency of an inactivated influenza vaccine administered by oral route.
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D000328:Adult; D000368:Aged; D000917:Antibody Formation; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000453:epidemiology / Q000517:prevention & control*; D008875:Middle Aged; D012383:Romania; D014611:Vaccination
chemical_list: D007252:Influenza Vaccines