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

Federico Armando, Georg Beythien, Franziska K. Kaiser, Lisa Allnoch, Laura Heydemann, Malgorzata Rosiak, Svenja Becker, Mariana Gonzalez-Hernandez, Mart M. Lamers, Bart L. Haagmans, Kate Guilfoyle, Geert van Amerongen, Malgorzata Ciurkiewicz, Albert D.M.E. Osterhaus, Wolfgang Baumgärtner*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

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.

Original languageEnglish
Article number3519
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - 20 Jun 2022

Bibliographical note

Funding
Open Access funding enabled and organized by Projekt DEAL.

Publisher Copyright: © 2022, The Author(s).

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