• Coronaviruses are a histological group of related viruses.

    There are several subfamilies, one of which is the recently discoveredt SARS-CoV2. Another one causes ~15% of all common colds.

    So it's quite possible to have an illness cause by a Coronavirus that isn't SARS-CoV2, unless it was meant that they were Positive for SARS-CoV2 but asymptomatic and therefore not suffering from Covid19.

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