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Histopathological and Immunological Findings in the Common Marmoset Following Exposure to Aerosolized SARS-CoV-2
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Histopathological and Immunological Findings in the Common Marmoset Following Exposure to Aerosolized SARS-CoV-2
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Histopathological and Immunological Findings in the Common Marmoset Following Exposure to Aerosolized SARS-CoV-2
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Journal Article
Histopathological and Immunological Findings in the Common Marmoset Following Exposure to Aerosolized SARS-CoV-2
2022
Overview
There is an enduring requirement to develop animal models of COVID-19 to assess the efficacy of vaccines and therapeutics that can be used to treat the disease in humans. In this study, six marmosets were exposed to a small particle aerosol (1–3 µm) of SARS-CoV-2 VIC01 that delivered the virus directly to the lower respiratory tract. Following the challenge, marmosets did not develop clinical signs, although a disruption to the normal diurnal temperature rhythm was observed in three out of six animals. Early weight loss and changes to respiratory pattern and activity were also observed, yet there was limited evidence of viral replication or lung pathology associated with infection. There was a robust innate immunological response to infection, which included an early increase in circulating neutrophils and monocytes and a reduction in the proportion of circulating T-cells. Expression of the ACE2 receptor in respiratory tissues was almost absent, but there was ubiquitous expression of TMPRSS2. The results of this study indicate that exposure of marmosets to high concentrations of aerosolised SARS-CoV-2 did not result in the development of clear, reproducible signs of COVID-19.
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