title: Portrait of a year-old pandemic.
authors.forename: Declan
authors.initials: D
authors.lastname: Butler
mesh_terms: D017677:Age Distribution; D035843:Biomedical Research / Q000706:statistics & numerical data*; D004196:Disease Outbreaks / Q000706:statistics & numerical data*; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology / Q000302:isolation & purification / Q000472:pathogenicity*; D009981:Influenza B virus / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification / Q000472:pathogenicity; D007252:Influenza Vaccines / Q000096:biosynthesis / Q000276:immunology / Q000600:supply & distribution; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology / Q000401:mortality / Q000821:virology*; D038622:Internationality; D011159:Population Surveillance; D013997:Time Factors; D014481:United States / Q000453:epidemiology; D014774:Virulence
chemical_list: D007252:Influenza Vaccines