Epitopes described in "Live and inactivated influenza vaccines induce similar humoral responses, but only live vaccines induce diverse T-cell responses in young children."

Article Authors:Daniel F Hoft; Elizabeth Babusis; Shewangizaw Worku; Charles T Spencer; Kathleen Lottenbach; Steven M Truscott; Getahun Abate; Isaac G Sakala; Kathryn M Edwards; C Buddy Creech; Michael A Gerber; David I Bernstein; Frances Newman; Irene Graham; Edwin L Anderson; Robert B Belshe
Article Title:Live and inactivated influenza vaccines induce similar humoral responses, but only live vaccines induce diverse T-cell responses in young children.
Reference Detail
Reference ID:1022393
Abstract:BACKGROUND: Two doses of either trivalent live attenuated or inactivated influenza vaccines (LAIV and TIV, respectively) are approved for young children (≥ 24 months old for LAIV and ≥ 6 months old for TIV) and induce protective antibody responses. However, whether combinations of LAIV and TIV are safe and equally immunogenic is unknown. Furthermore, LAIV is more protective than TIV in children for unclear reasons. METHODS: Children 6-35 months old were administered, 1 month apart, 2 doses of either TIV or LAIV, or combinations of LAIV and TIV in both prime/boost sequences. Influenza-specific antibodies were measured by hemagglutination inhibition (HAI), and T cells were studied in flow cytometric and functional assays. Highly conserved M1, M2, and NP peptides predicted to be presented by common HLA class I and II were used to stimulate interferon- enzyme-linked immunospot responses. RESULTS: All LAIV and/or TIV combinations were well tolerated and induced similar HAI responses. In contrast, only regimens containing LAIV induced influenza-specific CD4(+), CD8(+), and T cells, including T cells specific for highly conserved influenza peptides. CONCLUSIONS: Prime/boost combinations of LAIV and TIV in young children were safe and induced similar protective antibodies. Only LAIV induced CD4(+), CD8(+), and T cells relevant for broadly protective heterosubtypic immunity. CLINICAL TRIALS REGISTRATION: NCT00231907.
Affiliations:Department of Internal Medicine, Saint Louis University Vaccine and Treatment Evaluation Unit, Missouri, USA. hoftdf@slu.edu.
Reference Type:Literature
PubMed ID:21846636
Journal:J Infect Dis
Journal Volume:204
Article Pages:845-53
Journal ISSN:0022-1899
Article Chemical List:Antibodies, Viral;Influenza Vaccines;Vaccines, Attenuated;Vaccines, Inactivated
Article MeSH List:Antibodies, Viral(blood); Child, Preschool; Enzyme-Linked Immunospot Assay; Female; Flow Cytometry; Hemagglutination Inhibition Tests; Humans; Immunization, Secondary(adverse effects; methods); Infant; Influenza Vaccines(administration & dosage; adverse effects; immunology); Influenza, Human(prevention & control); Male; T-Lymphocytes(immunology); Vaccination(adverse effects; methods); Vaccines, Attenuated(administration & dosage; adverse effects; immunology); Vaccines, Inactivated(administration & dosage; adverse effects; immunology)
Curation Last Updated:2015-06-07 20:06:10