COVID-19 Outbreak Information Updates (Reboot) [over 150.000,000 US cases (est.), 6,422,520 US hospitilizations, 1,148,691 US deaths.]

So, I guess I wonder if the issues from other viral infections are as serious as that or if they tend to be more in the nature of less life threatening issues?

Other viral infections can, indeed, lead to myocarditis.

https://www.hopkinsmedicine.org/hea...s Causes,can lead to myocardial inflammation.