Effectiveness and durability of BNT162b2 vaccine against hospital and emergency department admissions due to SARS-CoV-2 omicron sub-lineages BA.1 and BA.2 in a large health system in the USA: a test-negative, case-control study

Tartof, Sara Y, Slezak, Jeff M, Puzniak, Laura · The Lancet Respiratory Medicine · 2023