title: Clinical manifestations seemed more severe among patients with antibody 4-fold or a greater increase in titer both against pH1N1 and against seasonal influenza than those whose antibody 4-fold or greater increase in titer was only against one type of seasonal influenza.
authors.forename: Tiegang
authors.initials: T
authors.lastname: Li
authors.forename: Ming
authors.initials: M
authors.lastname: Wang
mesh_terms: D000914:Antibodies, Viral / Q000097:blood*; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D007251:Influenza, Human / Q000276:immunology* / Q000821:virology; D012621:Seasons
chemical_list: D000914:Antibodies, Viral