title: Use of live cold-adapted influenza A H1N1 and H3N2 virus vaccines in seropositive adults.
abstract: To investigate the immunogenicity and protective efficacy of cold-adapted influenza vaccine in individuals with underlying immunity to influenza A virus, we administered cold-adapted H1N1 and H3N2 vaccines to adults with prevaccination serum hemagglutination inhibition antibody titers of 1:16 or more and challenged them 1 month afterwards with homologous wild-type influenza A virus. Both cold-adapted vaccines were immunogenic in seropositive adults. In addition, individuals receiving cold-adapted vaccines had lower rates of virus shedding and illness following challenge with wild-type influenza virus than did unvaccinated seropositive volunteers.
authors.affiliation: Department of Medicine, University of Rochester School of Medicine, New York 14642.
authors.forename: J J
authors.initials: JJ
authors.lastname: Treanor
authors.forename: F K
authors.initials: FK
authors.lastname: Roth
authors.forename: R F
authors.initials: RF
authors.lastname: Betts
mesh_terms: D000281:Administration, Intranasal; D000328:Adult; D000914:Antibodies, Viral / Q000096:biosynthesis*; D003080:Cold Temperature; D004311:Double-Blind Method; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007124:Immunoenzyme Techniques; D007070:Immunoglobulin A / Q000096:biosynthesis; D007071:Immunoglobulin A, Secretory / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000096:biosynthesis; D053118:Influenza A Virus, H1N1 Subtype; D053122:Influenza A Virus, H3N2 Subtype; D009980:Influenza A virus / Q000276:immunology* / Q000302:isolation & purification; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology*; D007251:Influenza, Human / Q000517:prevention & control*; D007273:Injections, Intramuscular; D009296:Nasal Cavity / Q000276:immunology / Q000382:microbiology; D011897:Random Allocation; D014613:Vaccines, Attenuated / Q000008:administration & dosage / Q000276:immunology; D015164:Vaccines, Inactivated / Q000008:administration & dosage / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D007070:Immunoglobulin A; D007071:Immunoglobulin A, Secretory; D007074:Immunoglobulin G; D007252:Influenza Vaccines; D014613:Vaccines, Attenuated; D015164:Vaccines, Inactivated