We keep learning more and more about this disease.
I am a fan of the New York Times Daily Podcast. One from a couple of days ago was this, Four New Insights About the Coronavirus.
Basically, it is not the flu. It is a vascular disease, which is why we are seeing all the physical impacts to people that go beyond the lungs. I highly recommend you listen to this particular podcast to keep up with the ever-changing characteristics and knowledge about the disease.
I also noted that Tom Hanks who had COVID-19 back in March reported that he has a decreasing number of antibodies in his blood. What that means for the future and the ability to catch the disease again is unknown. Note, he does have Type 2 diabetes.