title: Influenza case definitions need to be fit for purpose.
authors.affiliation: Department of Preventive and Social Medicine, Dunedin School of Medicine, University of Otago, New Zealand.
authors.forename: P
authors.initials: P
authors.lastname: Priest
authors.forename: H
authors.initials: H
authors.lastname: Kelly
mesh_terms: D000914:Antibodies, Viral / Q000097:blood*; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D007251:Influenza, Human / Q000453:epidemiology*; D008297:Male; D018571:Sentinel Surveillance
chemical_list: D000914:Antibodies, Viral