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Research

Comparative effectiveness of bivalent BA.4-5 and BA.1 mRNA booster vaccines among adults aged ≥50 years in Nordic countries: nationwide cohort study

BMJ 2023; 382 doi: https://doi.org/10.1136/bmj-2022-075286 (Published 25 July 2023) Cite this as: BMJ 2023;382:e075286

Linked Opinion

Why older adults can continue to benefit from covid-19 boosters