omicron

sars-cov infection

covid vaccination

booster

sars-cov_88512

vaccine_53291

sars-cov_55575

unvaccinated

vaccine_84243

delta variant

New England Journal of Medicine

Only modest differences in vaccine effectiveness were noted with the delta variant as compared with the alpha variant after the receipt of two vaccine doses. Absolute differences in vaccine effectiveness were more marked after the receipt of the first dose. This finding would support efforts to maximize vaccine uptake with two doses among vulnerable populations. (Funded by Public Health England.).

Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant