title: The perennial threat of influenza pandemics.
authors.forename: Carlos
authors.initials: C
authors.lastname: Del Rio
authors.forename: Carlos
authors.initials: C
authors.lastname: Franco-Paredes
mesh_terms: D000818:Animals; D004196:Disease Outbreaks; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D008800:Mexico / Q000453:epidemiology; D014481:United States / Q000453:epidemiology; D014944:World Health Organization
chemical_list: D007252:Influenza Vaccines