title: Antibody Responses to Trivalent Inactivated Influenza Vaccine in Health Care Personnel Previously Vaccinated and Vaccinated for The First Time.
abstract: Inactivated influenza vaccination induces a hemagglutinin-specific antibody response to the strain used for immunization. Annual vaccination is strongly recommended for health care personnel. However, it is debatable if repeated vaccination would affect the antibody response to inactivated influenza vaccine through the time. We enrolled health care personnel who had repeated and first trivalent inactivated influenza vaccination in 2005-2008. Serological antibody responses were measured by hemagglutination-inhibition (HI) test. Subjects with repeated vaccination had higher pre-vaccination and lower post-vaccination HI titer than those with first vaccination, although serological responses between groups might vary with different antigen types and while the drifted strain was introduced in the vaccine. Higher fold rise in the HI titer was observed in the group with first than repeated vaccination and the fold increase in the HI titer was inversely correlated with pre-vaccination titer in 2007 and 2008. Nevertheless, no significant difference in the day 28 seroprotection rate was observed between groups with repeated and first vaccination in most circumstances. Further studies are needed to understand the long-term effect of repeated vaccination on the antibody response both at the serological and repertoire levels among health care personnel.
authors.affiliation: Division of Infectious Diseases, Department of Pediatrics, Chang Gung Children's Hospital, Chang Gung Memorial Hospital, Taoyuan, Taiwan.|Molecular Infectious Disease Research Centre, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
authors.forename: Kuan-Ying A
authors.initials: KA
authors.lastname: Huang
authors.affiliation: Department of Laboratory Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
authors.forename: Shih-Cheng
authors.initials: SC
authors.lastname: Chang
authors.affiliation: Division of Infectious Diseases, Department of Pediatrics, Chang Gung Children's Hospital, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
authors.forename: Yhu-Chering
authors.initials: YC
authors.lastname: Huang
authors.affiliation: Division of Infectious Diseases, Department of Pediatrics, Chang Gung Children's Hospital, Chang Gung Memorial Hospital, Taoyuan, Taiwan.|Molecular Infectious Disease Research Centre, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
authors.forename: Cheng-Hsun
authors.initials: CH
authors.lastname: Chiu
authors.affiliation: Division of Infectious Diseases, Department of Pediatrics, Chang Gung Children's Hospital, Chang Gung Memorial Hospital, Taoyuan, Taiwan.|College of Medicine, Chang Gung University, Taoyuan, Taiwan.|Ministry of Health and Welfare, Taipei, Taiwan.
authors.forename: Tzou-Yien
authors.initials: TY
authors.lastname: Lin
mesh_terms: D000293:Adolescent; D000328:Adult; D000914:Antibodies, Viral / Q000097:blood; D000917:Antibody Formation; D005260:Female; D006282:Health Personnel; D006385:Hemagglutination Inhibition Tests; D006389:Hemagglutinins, Viral / Q000276:immunology; D006801:Humans; D007117:Immunization, Secondary; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology / Q000378:metabolism; D053122:Influenza A Virus, H3N2 Subtype / Q000276:immunology / Q000378:metabolism; D009981:Influenza B virus / Q000276:immunology / Q000378:metabolism; D007252:Influenza Vaccines / Q000276:immunology*; D007251:Influenza, Human / Q000473:pathology / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D014611:Vaccination; D015164:Vaccines, Inactivated / Q000276:immunology*; D055815:Young Adult
chemical_list: D000914:Antibodies, Viral; D006389:Hemagglutinins, Viral; D007252:Influenza Vaccines; D015164:Vaccines, Inactivated