Comparison of the Influenza Virus-Specific Effector and Memory B-Cell Responses to Immunization of Children and Adults with Live Attenuated or Inactivated Influenza Virus Vaccines

Abstract

Cellular immune responses to influenza virus infection and influenza virus vaccination have not been rigorously characterized.We quantified the effector and memory B-cell responses in children and adults after administration of either live attenuated (LAIV) or inactivated (TIV) influenza virus vaccines and compared these to antibody responses. Peripheral blood mononuclear cells were collected at days 0, 7 to 12, and 27 to 42 after immunization of younger children (6 months to 4 years old), older children (5 to 9 years old), and adults. Influenza virus-specific effector immunoglobulin A (IgA) and IgG circulating antibody-secreting cells (ASC) and stimulated memory B cells were detected using an enzyme-linked immunospot assay. Circulating influenza virus-specific IgG and IgA ASC were detected 7 to 12 days after TIV and after LAIV immunization. Seventynine percent or more of adults and older children had demonstrable IgG ASC responses, while IgA ASC responses were detected in 29 to 53% of the subjects. The IgG ASC response rate to LAIV immunization in adults was significantly higher than the response rate measured by standard serum antibody assays (26.3% and 15.8% by neutralization and hemagglutination inhibition assays, respectively). IgG ASC and serum antibody responses were relatively low in the younger children compared to older children and adults. TIV, but not LAIV, significantly increased the percentage of circulating influenza virus-specific memory B cells detected at 27 to 42 days after immunization in children and adults. In conclusion, although both influenza vaccines are effective, we found significant differences in the B-cell and antibody responses elicited after LAIV or TIV immunization in adults and older children and between young children and older age groups.

Adjuvanted H5N1 vaccine induces early CD4+T cell response that predicts long-term persistence of protective antibody levels

“…Moreover, in subjects immunized with MF59-H5N1 both cell-mediated and antibody responses are strongly boosted by a third dose given 5 months after priming, indicative of the induction of immunological memory. Of note, the frequency of H5N1-IgG MBC measured after 3 doses of MF59-adjuvanted vaccines is comparable to that observed after seasonal influenza vaccination (20,21).…”

Humoral, T-cell and B-cell immune responses to seasonal influenza vaccine in solid organ transplant recipients receiving anti-T cell therapies

“…This could be also explained by the relatively modest sample size of our study. While we only evaluated one single time-point after vaccination, previous work has showed that a significant increase in blood MBC levels was observed between 27-42 days after influenza vaccination in healthy adults [40,44].…”

Discordance between antibody and T cell responses in recipients of trivalent inactivated influenza vaccine

“…Microneutralization antibody titers were determined using minor modifications of a previously reported method [24,25]. Ten 2 fold dilutions of serum, starting at 1:10 and ending at 1:5120, were made in culture medium [modified Eagle's medium ( MEM) −1% BSA with Penicillin Streptomycin] and 50 µl of each dilution was mixed with 50 µl containing 50% Tissue Culture Infective Dose of the H1N1 A/New Caledonia/20/99 or H3N2 A/Wisconsin/67/2005 viruses.…”