The age distribution is quite a signal that this is plausible. Then we have the Italian study that said only 1% had no other comorbidity. And then you have a fe

The age distribution is quite a signal that this is plausible. Then we have the Italian study that said only 1% had no other comorbidity. And then you have a few cases with enough details to go looking, usually the first death in a city/region or notable cases. As a random example this: https://www.lehighvalleylive.com/coronavirus/2020/03/first-lehigh-county-resident-to-die-from-the-coronavirus-was-80-official-says.html https://www.lehighvalleylive.com/coronavirus/2020/03/first-l...