A novel mammalian cell-culture technique for consistent production of a well-tolerated and immunogenic trivalent subunit influenza vaccine.
Conventional influenza vaccine production methods have limitations due to their reliance on chicken eggs. We evaluated whether a mammalian cell-culture system could reliably produce an influenza vaccine with favourable tolerability and immunogenicity profiles. Adult subjects (n=1200; 18-60 years of age) were randomized (2:2:2:1) to receive either one of three lots of a cell-culture-derived influenza vaccine (CCIV) or an egg-based trivalent inactivated influenza vaccine (TIV). Safety and reactogenicity were assessed using solicited indicators for 7 days post-vaccination, all other adverse events (AEs) were recorded for 21 days post-vaccination, and all serious AEs and AEs necessitating a physician's visit, and/or resulting in subject's withdrawal from the study, were collected for up to 6 months post-vaccination. Antibody titres were measured by haemagglutination inhibition (HI) assay using egg-based viral antigens. All three lots of CCIV had similar safety and tolerability profiles, analogous to those of the TIV. Lot-to-lot consistency was statistically demonstrated through bioequivalence for immunogenicity. Antibody titres assessed at 6 months demonstrated good persistence. This Phase III trial is the first to demonstrate lot-to-lot bioequivalence of a CCIV and persistence of immunogenicity in comparison with a TIV.
Ambrozaitis
Arvydas
A
Vilnius University, Vilnius, Lithuania.
Groth
Nicola
N
Bugarini
Roberto
R
Sparacio
Vittoria
V
Podda
Audino
A
Lattanzi
Maria
M
D000328:Adult; D000914:Antibodies, Viral / Q000097:blood / Q000276:immunology; D018929:Cell Culture Techniques / Q000379:methods*; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007252:Influenza Vaccines / Q000009:adverse effects / Q000096:biosynthesis / Q000276:immunology*; D007251:Influenza, Human / Q000276:immunology / Q000517:prevention & control*; D008297:Male; D008875:Middle Aged; D011786:Quality Control; D015164:Vaccines, Inactivated / Q000276:immunology; D055815:Young Adult
D000914:Antibodies, Viral; D007252:Influenza Vaccines; D015164:Vaccines, Inactivated