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Nat Med ; 26(6): 842-844, 2020 06.
Article in English | MEDLINE | ID: covidwho-244490

ABSTRACT

Respiratory immune characteristics associated with Coronavirus Disease 2019 (COVID-19) severity are currently unclear. We characterized bronchoalveolar lavage fluid immune cells from patients with varying severity of COVID-19 and from healthy people by using single-cell RNA sequencing. Proinflammatory monocyte-derived macrophages were abundant in the bronchoalveolar lavage fluid from patients with severe COVID-9. Moderate cases were characterized by the presence of highly clonally expanded CD8+ T cells. This atlas of the bronchoalveolar immune microenvironment suggests potential mechanisms underlying pathogenesis and recovery in COVID-19.


Subject(s)
Betacoronavirus/pathogenicity , Coronavirus Infections/immunology , Coronavirus Infections/pathology , Pneumonia, Viral/immunology , Pneumonia, Viral/pathology , Single-Cell Analysis , Bronchoalveolar Lavage Fluid/immunology , Bronchoalveolar Lavage Fluid/virology , CD8-Positive T-Lymphocytes/immunology , CD8-Positive T-Lymphocytes/virology , Coronavirus Infections/diagnosis , Coronavirus Infections/virology , Humans , Pandemics , Pneumonia, Viral/diagnosis , Pneumonia, Viral/virology
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