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SARS-CoV-2 is known to infect cells of the respiratory tract. A deeper understanding of which cells support the infection, and to what extent, could lead to insights into disease progression and severity. Scientists at the UNC School of Medicine sought to understand which cells in the airway the virus infects, and how it gets into the lungs in the patients who develop pneumonia. To this end, they have characterized some of the ways in which SARS-CoV-2 infects the nasal cavity and infects and replicates progressively less well in cells lower down the respiratory tract—including the lungs.

Image: SARS-CoV-2 (red) infected ciliated cells in the COVID-19 patient's bronchi. (Takanori Asakura, PhD, UNC School of Medicine)