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Openai/69716778-c854-8005-8bde-90ffbbce5a8b
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===== ✅ 2.5 〜 4 百万 人の命を救った(2020-2024) ===== * 2020年から2024年までの世界規模の疫学的研究によると、COVID-19ワクチンは約2.5 百万(250万人)もの死亡を防いだと推定されています(感度分析では1.4〜4.0 百万の範囲)。JAMA Network<ref>{{cite web|title=JAMA Network|url=https://jamanetwork.com/journals/jama-health-forum/fullarticle/2836434|publisher=JAMA Network|access-date=2026-01-22}}</ref> 📌 補足:推定値の不確実性 * この2.5 百万という数字は統計モデルに基づく推計で、実際の「ワクチンがあった場合」と「なかった場合」の死亡差を比較する形で計算されています。感度分析によってはもっと多い(最大約4 百万)可能性も示唆されています。JAMA Network<ref>{{cite web|title=JAMA Network|url=https://jamanetwork.com/journals/jama-health-forum/fullarticle/2836434|publisher=JAMA Network|access-date=2026-01-22}}</ref> ✅ 約20 百万 人の命を救ったという推計(初年度モデル) * 別の大規模なモデル研究(Imperial College Londonなど)が、ワクチン導入後1年間(2020年末〜2021年末)だけで約1,980万(約20 百万)件の死亡を防いだと推定したものもあります。Covid Vaccine Research Hub<ref>{{cite web|title=Covid Vaccine Research Hub|url=https://www.covidvaccineresearch.org/news/covid-19-vaccines-prevented-20-million-deaths-worldwide-first-year-estimates-imperial|publisher=Covid Vaccine Research Hub|access-date=2026-01-22}}</ref> ※これは主に初期のワクチン拡大期のモデルに基づく推計で、全期間の推計とは手法が異なります。
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