title: Standardization of terminology of the pandemic A(H1N1) 2009 virus.
mesh_terms: D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology*; D058873:Pandemics; D009626:Terminology as Topic