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Jamie Lopez Bernal, Nick J Andrews, Charlotte Gower, Eileen Gallagher, Ruth Simmons, Simon Thelwall, Julia Stowe, Elise Tessier, Natalie Groves, Gavin Dabrera and 9 more
Background The B.1.617.2 COVID-19 variant has contributed to the surge in cases in India and has now been detected across the globe, including a notable increase in cases in the UK. We estimate the effectiveness of the BNT162b2 and ChAdOx1 COVID-19 vaccines against this variant. Methods A test negative case control design was used to estimate the effectiveness of vaccination against symptomatic disease with both variants over the period that B.1.617.2 began circulating with cases identified based on sequencing and S-gene target status. Data on all symptomatic sequenced cases of COVID-19 in England was used to estimate the proportion of cases with B.1.617.2 compared to the predominant strain (B.1.1.7) by vaccination status. Results Effectiveness was notably lower after 1 dose of vaccine with B.1.617.2 cases 33.5% (95%CI: 20.6 to 44.3) compared to B.1.1.7 cases 51.1% (95%CI: 47.3 to 54.7) with similar results for both vaccines. With BNT162b2 2 dose effectiveness reduced from 93.4% (95%CI: 90.4 to 95.5) with B.1.1.7 to 87.9% (95%CI: 78.2 to 93.2) with B.1.617.2. With ChAdOx1 2 dose effectiveness reduced from 66.1% (95% CI: 54.0 to 75.0) with B.1.1.7 to 59.8% (95%CI: 28.9 to 77.3) with B.1.617.2. Sequenced cases detected after 1 or 2 doses of vaccination had a higher odds of infection with B.1.617.2 compared to unvaccinated cases (OR 1.40; 95%CI: 1.13-1.75). Conclusions After 2 doses of either vaccine there were only modest differences in vaccine effectiveness with the B.1.617.2 variant. Absolute differences in vaccine effectiveness were more marked with dose 1. This would support maximising vaccine uptake with two doses among vulnerable groups.
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Bernal, J. L., Andrews, N. J., Gower, C., Gallagher, E., Simmons, R., Thelwall, S., Stowe, J., Tessier, E., Groves, N., Dabrera, G., Myers, R. E., Campbell, C., Amirthalingam, G., Edmunds, M., Zambon, M. C. F. A., Brown, K. E., Hopkins, S., Chand, M. A., & Ramsay, M. E. (2021). Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant. New England Journal of Medicine, 385(7), 585–594. https://doi.org/10.1056/nejmoa2108891
Bernal, Jamie Lopez, et al. "Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant." New England Journal of Medicine, vol. 385, no. 7, 2021, pp. 585–594, https://doi.org/10.1056/nejmoa2108891.
Bernal, Jamie Lopez, Nick J Andrews, Charlotte Gower, Eileen Gallagher, Ruth Simmons, Simon Thelwall, Julia Stowe, et al. "Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant." New England Journal of Medicine 385, no. 7 (2021): 585–594. https://doi.org/10.1056/nejmoa2108891.
Bernal J. L., Andrews N. J., Gower C. [и др.] Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant // New England Journal of Medicine. — 2021. — Vol. 385, № 7. — P. 585–594. — URL: https://doi.org/10.1056/nejmoa2108891
@article{bernal2021effectiveness,
title = {{Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant}},
author = {Jamie Lopez Bernal and Nick J Andrews and Charlotte Gower and Eileen Gallagher and Ruth Simmons and Simon Thelwall and Julia Stowe and Elise Tessier and Natalie Groves and Gavin Dabrera and Richard E. Myers and Colin Campbell and Gayatri Amirthalingam and Matt Edmunds and Maria Cristina Fleischmann Alves Zambon and Kevin Edward Brown and Susan Hopkins and Meera A Chand and Mary Elizabeth Ramsay},
journal = {New England Journal of Medicine},
year = {2021},
volume = {385},
number = {7},
pages = {585--594},
doi = {10.1056/nejmoa2108891},
url = {https://doi.org/10.1056/nejmoa2108891}
}TY - JOUR AU - Bernal, Jamie Lopez AU - Andrews, Nick J AU - Gower, Charlotte AU - Gallagher, Eileen AU - Simmons, Ruth AU - Thelwall, Simon AU - Stowe, Julia AU - Tessier, Elise AU - Groves, Natalie AU - Dabrera, Gavin AU - Myers, Richard E. AU - Campbell, Colin AU - Amirthalingam, Gayatri AU - Edmunds, Matt AU - Zambon, Maria Cristina Fleischmann Alves AU - Brown, Kevin Edward AU - Hopkins, Susan AU - Chand, Meera A AU - Ramsay, Mary Elizabeth TI - Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant JO - New England Journal of Medicine VL - 385 IS - 7 SP - 585 EP - 594 PY - 2021 DA - 2021/07/21 DO - 10.1056/nejmoa2108891 UR - https://doi.org/10.1056/nejmoa2108891 ER -
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