@article{Heath_P-2022_102303,
title = {Safety and efficacy of the NVX-CoV2373 coronavirus disease 2019 vaccine at completion of the placebo-controlled phase of a randomized controlled trial},
author = {Heath, P. and Galiza, E. and Baxter, D. and Boffito, M. and Browne, D. and Burns, F. and Chadwick, D. and Clark, R. and Cosgrove, C. and Galloway, J. and Goodman, A. and Heer, A. and Higham, A. and Iyengar, S. and Jeanes, C. and Kalra, P. and Kyriakidou, C. and Bradley, J. and Munthali, C. and Minassian, A. and McGill, F. and Moore, P. and Munsoor, I. and Nicholls, H. and Osanlou, O. and Packham, J. and Pretswell, C. and Francisco Ramos, A. and Saralaya, D. and Sheridan, R. and Smith, R. and Soiza, R. and Swift, P. and Thomson, E. and Turner, J. and Viljoen, M. and Fries, L. and Cho, I. and McKnight, I. and Glenn, G. and Rivers, E. and Robertson, A. and Alves, K. and Smith, K. and Toback, S.},
month = {oct},
year = {2022},
abstract = {Background: The recombinant protein-based vaccine, NVX-CoV2373, demonstrated 89.7% efficacy against coronavirus disease 2019 (COVID-19) in a phase 3, randomized, observer-blinded, placebo-controlled trial in the United Kingdom. The protocol was amended to include a blinded crossover. Data to the end of the placebo-controlled phase are reported. Methods: Adults aged 18–84 years received 2 doses of NVX-CoV2373 or placebo (1:1) and were monitored for virologically confirmed mild, moderate, or severe COVID-19 (onset from 7 days after second vaccination). Participants who developed immunoglobulin G (IgG) against nucleocapsid protein but did not show symptomatic COVID-19 were considered asymptomatic. Secondary outcomes included anti-spike (S) IgG responses, wild-type virus neutralization, and T-cell responses. Results: Of 15 185 participants, 13 989 remained in the per-protocol efficacy population (6989 NVX-CoV2373, 7000 placebo). At a maximum of 7.5 months (median, 4.5) postvaccination, there were 24 cases of COVID-19 among NVX-CoV2373 recipients and 134 cases among placebo recipients, a vaccine efficacy of 82.7% (95% confidence interval [CI], 73.3%–88.8%). Vaccine efficacy was 100% (95% CI, 17.9%–100.0%) against severe disease and 76.3% (95% CI, 57.4%–86.8%) against asymptomatic disease. High anti-S and neutralization responses to vaccination were evident, together with S-protein–specific induction of interferon-γ secretion in peripheral blood T cells. Incidence of serious adverse events and adverse events of special interest were similar between groups. Conclusions: A 2-dose regimen of NVX-CoV2373 conferred a high level of ongoing protection against asymptomatic, symptomatic, and severe COVID-19 through &gt;6 months postvaccination. A gradual decrease of protection suggests that a booster may be indicated.},
pages = {398-407},
volume = {76},
issue = {3},
journal = {Clinical Infectious Diseases},
publisher = {Oxford University Press},
url = {https://doi.org/10.1093/cid/ciac803},
}
