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In the beginning nobody knew what it was and it went through some name changes over the first few months. It the beginning (from what I remember) it was nCov19 (as in Novel Coronavirus). Eventually people figured out it was an off-shoot of SARS-Cov (from 2004) so it settled as SARS-CoV-2 and the respective cluster of symptoms/disease as CoVID-19 (CoronaVirus Infectious Disease).