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Covid-19: COrona VIrus DIsease - 2019 (the year the disease was identified). Coronavirus: A family of viruses that cause illness ranging from common cold to more severe diseases. SARS-CoV-2: Severe Acute Respiratory Syndrome Coronavirus 2 (the virus that causes Covid-19).
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…in reply to @axbom
Corona: latin word that means "crown" or "halo", referring to the shape of the virus particle when viewed under a microscope.