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アメリカのコロナ死者数が大幅減少、新たな変異株「NB.1.8.1」への備えも忘れずにン

2025年5月最終週、アメリカ疾病予防管理センター(CDC)は最新の新型コロナウイルスによる死亡者数を公表しました。これによると、アメリカ国内では死者数の大幅な減少が続いており、感染状況は全体的に落ち着きつつあります。

しかしながら、現在アジア地域を中心に拡大している新たな変異株「NB.1.8.1」が、アメリカ国内でも複数の地域で確認されています。今回は総合内科専門医の本多医師に、現在の感染状況や変異株の特徴、そして私たちができる備えについて伺いました。

死亡者数は5カ月で9割減 アメリカ国内の状況

本多医師によると、2025年に入って以降、アメリカでは週ごとのコロナ死亡者数が順調に減少しています。CDCの統計によると、1月上旬には1000人を超えていた死者数が、5月末にはわずか90人にまで減少。実に5カ月で9割近い減少という結果になっています。

こうした数値からも、アメリカにおけるコロナの感染状況は沈静化の方向にあることがうかがえます。

注目すべき新たな変異株「NB.1.8.1」とは?

現在、中国や台湾などで拡大している変異株「NB.1.8.1」は、2025年5月にWHO(世界保健機関)によって「監視対象の変異株」に指定されました。

この株は、2025年1月に最初に確認されて以来、世界22カ国から500件以上のウイルス配列が報告されており、西太平洋、ヨーロッパ、そしてアメリカでも増加の傾向が見られています。

NB.1.8.1はスパイクタンパク質に複数の変異があり、感染力や免疫回避性の一部が高まっている可能性が指摘されています。ただし現時点では、重症化リスクや致死率の上昇は見られておらず、既存のワクチンも一定の有効性を保っているとされています。

再流行に備えて、私たちができること

「新たな変異株が登場したからといって、過度に不安になる必要はありません」と本多医師は話します。

確かにNB.1.8.1のような変異株の存在には注意が必要ですが、基本的な感染対策や体調管理、そしてワクチンの接種確認を継続することが、今後の再流行を防ぐ鍵となります。

特に、日々の手洗いや換気といった習慣は、たとえ大きな流行がなくとも、自身と家族の健康を守るために欠かせない行動です。

編集部まとめ

アメリカでは死亡者数が減少傾向にあり、新型コロナウイルスの感染状況は明るい兆しを見せています。一方で、新たな変異株「NB.1.8.1」が複数の地域で確認されていることから、引き続き油断せず、基本的な予防策を実践することが大切です。

毎日のちょっとした心がけが、大きな安心につながる――そんな時期が、今なのかもしれません。

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