シリアのハムスターにおけるSARS-CoV-2オミクロンの病原性,伝染性,適性

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Shuofeng Yuan¹, Zi-Wei Ye¹, Ronghui Liang¹

¹State Key Laboratory of Emerging Infectious Diseases, Carol Yu Centre for Infection, Department of Microbiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China.

Science (New York, N.Y.)

|June 23, 2022

まとめ

SARS-CoV-2のオミクロン型は病原性が低く,デルタ型と比較してハムスターの重症度が低くなります. しかし,オミクロンは高い伝染性を示し,新しいワクチンと抗ウイルス薬を必要とします.

科学分野:

ウイルス学
感染症
免疫学

背景:

SARS-CoV-2 オミクロン変種の体内特性は,ほとんど不明である.
オミクロンの病原性,伝染性,適性を理解することは,公衆衛生にとって極めて重要です.
オミクロンの影響を評価するには,デルタ型との比較が不可欠です.

研究の目的:

SARS-CoV-2 オミクロン型とデルタ型の内生病原性,伝染性,適性を比較する.
異なる免疫選択圧力の下で変異体のパフォーマンスを評価する.
オミクロンに対する効果的な対策の開発に役立つ.

主な方法:

シリアのハムスターモデルを使ったCOVID-19
臨床スコア,体重減少,呼吸道ウイルス負荷の評価
コンタクトと非コンタクトの伝送ダイナミクスを評価
異なる免疫圧力の下で研究された変異の競争.

主要な成果:

オミクロンに感染したハムスターは,デルタに感染したハムスターと比較して,疾患の重度,ウイルス負荷,および肺損傷が著しく減少した.
両方の変種は接触経由で高い感染率を示した.
オミクロンは非接触試験でデルタと比べて比較可能かより高い感染性を示した.
デルタは免疫圧力がなくオミクロンに勝ったがこれは特定の抗体選択によって変化した.

結論:

SARS-CoV-2 オミクロン型は,体内ではデルタ型よりも病原性が低い.
オミクロンは伝染性が高く,公衆衛生に重大な脅威をもたらします.
オミクロンに有効な次世代ワクチンと抗ウイルス薬の緊急開発が必要である.

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