title: Influenza viruses do their best to thwart next winter's vaccine.
mesh_terms: D006801:Humans; D009980:Influenza A virus / Q000145:classification*; D007252:Influenza Vaccines / Q000276:immunology*; D007251:Influenza, Human / Q000517:prevention & control*; D014481:United States
chemical_list: D007252:Influenza Vaccines