| A coronavirus is a kind of common virus that causes an infection in your nose, sinuses, or upper throat.They’re called coronaviruses because under a microscope, they look like a crown. Coronavirus disease 2019, or COVID-19, is a disease that can cause what doctors call a respiratory tract infection. It can affect your upper respiratory tract (sinuses, nose, and throat) or lower respiratory tract (windpipe and lungs). |
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