IIRC the problem of finding a "cure" is that viruses get frustrated if the fail to reproduce, so the way they deal with that is to mutate. When they do that the vaccine that was working no longer works on the new strain of virus. That is, basically, why the flu virus is still with us and likely always will be. And why I don't bother with flu shots. They are treating (mostly) last years virus. Working diligently to keep the virus from spreading is about the best we can do.
Everything I've read suggests that the common flu is more widespread and deadlier that the Corona virus, yet because we have it "under control," since we have a vaccine of dubious value, there is little concern about it and no panicked media such as we see now.
A little info follows.
-----
First published on January 27, 2020, this article is of relevance to an understanding of recent developments including the so-called Second Wave. The similarity of the symptoms of Covid-19 and seasonal influenza was known and documented from the very outset, reported in numerous peer reviewed...
www.globalresearch.ca