title: Flu vaccination campaign poses monitoring difficulties.
authors.forename: Roger
authors.initials: R
authors.lastname: Collier
mesh_terms: D002170:Canada / Q000453:epidemiology; D004196:Disease Outbreaks / Q000517:prevention & control*; D006293:Health Promotion / Q000458:organization & administration*; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000627:therapeutic use*; D007251:Influenza, Human / Q000453:epidemiology / Q000517:prevention & control*
chemical_list: D007252:Influenza Vaccines