Lessons learned.
D004196:Disease Outbreaks / Q000517:prevention & control*; D014943:Global Health; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007252:Influenza Vaccines / Q000096:biosynthesis / Q000600:supply & distribution; D007251:Influenza, Human / Q000453:epidemiology / Q000517:prevention & control*
D007252:Influenza Vaccines