SARS-CoV-2 Omicron variant causes mild pathology in the upper and lower respiratory tract of hamsters.

SARS-CoV-2 Omicron variant causes mild pathology in the upper and lower respiratory tract of hamsters.
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DOI:
10.1038/s41467-022-31200-y
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发表时间:
2022-06-20
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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自 2019 年发现以来,已发现严重急性呼吸综合征冠状病毒-2 (SARS-CoV-2) 的多种变种。本研究调查了叙利亚金仓鼠鼻内 SARS-CoV-2 Omicron 感染后 4 天的上呼吸道和下呼吸道的病毒传播和相关病理,与受关注变体 (VOC) Gamma 和 Delta 以及祖先菌株 614 G 的感染进行比较。VOC Omicron 感染仓鼠上呼吸道和下呼吸道的病理变化比其他研究菌株引起的病理变化要轻。 VOC Omicron 感染会引起轻度鼻炎,几乎不影响嗅上皮,肺部病变也很少,但肺泡室经常不受损害。同样,VOC Omicron 感染仓鼠的呼吸道组织中的病毒抗原、RNA 和传染性病毒滴度较低。这些发现表明,该变体对仓鼠上呼吸道和下呼吸道的致病性降低。自 SARS-CoV-2 出现以来,已经确定了几种令人担忧的变体,这些变体改变了疾病进展和传播动态。在这里,阿曼多等人。比较 VOC Gamma、Delta 和 Omicron 感染 4 天后叙利亚金仓鼠上呼吸道和下呼吸道的病毒传播和病理学,发现 Omicron 的病理学较温和。
Since its discovery in 2019, multiple variants of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) have been identified. This study investigates virus spread and associated pathology in the upper and lower respiratory tracts of Syrian golden hamsters at 4 days post intranasal SARS-CoV-2 Omicron infection, in comparison to infection with variants of concern (VOCs) Gamma and Delta as well as ancestral strain 614 G. Pathological changes in the upper and lower respiratory tract of VOC Omicron infected hamsters are milder than those caused by other investigated strains. VOC Omicron infection causes a mild rhinitis with little involvement of the olfactory epithelium and minimal lesions in the lung, with frequent sparing of the alveolar compartment. Similarly, viral antigen, RNA and infectious virus titers are lower in respiratory tissues of VOC Omicron infected hamsters. These findings demonstrate that the variant has a decreased pathogenicity for the upper and lower respiratory tract of hamsters. Since the emergence of SARS-CoV-2 several variants of concerns have been identified, with altered disease progression and transmission dynamics. Here, Armando et al. compare virus spread and pathology in the upper and lower respiratory tracts of Syrian golden hamster after 4 days post infection for VOCs Gamma, Delta and Omicron and find milder pathology for Omicron.
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