Antibody and B cell responses to an investigational adjuvanted RSV vaccine for older adults.
Adriana WeinbergStacie L LambertJennifer CanniffLi YuNancy LangMark T EsserJudith FalloonMyron J LevinPublished in: Human vaccines & immunotherapeutics (2019)
Background: Infections with respiratory syncytial virus (RSV) cause significant morbidity and hospitalization in older adults. We studied the humoral, mucosal and B cell responses of an investigational adjuvanted RSV sF vaccine, MEDI7510, in older adults. Methods: In a substudy of a randomized (1:1), double-blind, placebo-controlled study of MEDI7510 in adults ≥60 years of age, we collected blood and nasal secretions at days 0, 8, 29, 91 and 180 post-vaccination to measure F-specific IgG and IgA antibodies by ELISA, and plasmablasts and memory B cells by IgA/IgG dual-color fluorospot. Results: The 27 vaccine- and 18 placebo-recipients had a mean age of 73 years and included 24 women. Among vaccinees, 93% had significant increases in F-specific plasma IgG 85% had increased plasma IgA; 74% had increased nasal IgG and 26% nasal IgA; 93% had IgG and 89% IgA plasmablasts on Day 8 post-immunization; and 82% had IgG and 7.4% IgA memory B cell responses to the vaccine. Vaccinees <70 years of age and women had the highest responses to the vaccine. Conclusions: This adjuvanted vaccine generated robust humoral immune responses in older adults, including RSV F-specific systemic and mucosal antibodies and memory B cells. Nevertheless, age ≥70 years was associated with decreased immunogenicity of the adjuvanted vaccine.
Keyphrases
- respiratory syncytial virus
- immune response
- physical activity
- double blind
- clinical trial
- metabolic syndrome
- polycystic ovary syndrome
- randomized controlled trial
- respiratory tract
- skeletal muscle
- placebo controlled
- phase ii
- dendritic cells
- adipose tissue
- insulin resistance
- chronic rhinosinusitis
- phase iii
- pregnancy outcomes
- drug induced