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横からだけどシステマティックレビューを見ても感染予防効果は低くても重症化予防効果は十分あったと思うけどな

A Systematic Review and Meta-Analysis on the Real-World Effectiveness of COVID-19 Vaccines against Infection, Symptomatic and Severe COVID-19 Disease Caused by the Omicron Variant (B.1.1.529)
DOI: 10.3390/vaccines11020224

Protective effectiveness of previous SARS-CoV-2 infection and hybrid immunity against the omicron variant and severe disease: a systematic review and meta-regression
DOI: 10.1016/S1473-3099(22)00801-5

Vaccine effectiveness across the Omicron evolutionary spectrum (BA.2, BA.5, XBB, JN.1, KP.3): a systematic review of studies published 2022–2025
DOI: 10.1186/s12879-026-13281-y