title: Preexisting immunity to pandemic (H1N1) 2009.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xing
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Cardona
mesh_terms: D000595:Amino Acid Sequence; D057134:Antibodies, Neutralizing / Q000097:blood; D000914:Antibodies, Viral / Q000097:blood; D000956:Antigens, Viral / Q000235:genetics; D021821:Communicable Diseases, Emerging / Q000453:epidemiology / Q000276:immunology* / Q000821:virology*; D017124:Conserved Sequence; D056738:Cross Protection; D003429:Cross Reactions; D004196:Disease Outbreaks; D000939:Epitopes / Q000235:genetics; D015395:Histocompatibility Antigens Class I; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics / Q000276:immunology*; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology* / Q000821:virology*
chemical_list: D057134:Antibodies, Neutralizing; D000914:Antibodies, Viral; D000956:Antigens, Viral; D000939:Epitopes; D015395:Histocompatibility Antigens Class I