Live imaging of human bronchial cells growing in the lab tracks the relationship between the COVID-19 virus SARS-CoV-2 with mucus and ciliary action – wafting by the airway cells' hairy projections. Such muco-ciliary clearance (MCC) in life aims to protect against infection by moving mucus up to the throat for expulsion, keeping the airways open. This study finds that MCC initially facilitates SARS-CoV-2 infection but subsequently inhibits spread
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