Coronavirus is more like rabies than influenza, stop thinking of it like seasonal flu, it is far more serious. The difference lies in the DNA of the virus. The DNA makes it a zoonotic disease just like rabies. Unfortunately, every so often the prolific mutations undergone by viruses makes them communicable from animal to people, just like rabies. Unfortunately, unlike rabies coronavirus started out as a respiratory illness in animals and remained that way when it evolved to attacking humans. And then the worst happened and coronavirus became communicable person to person through coughs.
Now, here’s the kicker just because the DNA has mutated enough to allow it to use humans as a host, doesn’t make it a human disease. It is STILL a zoonotic (animal disease) virus… just like rabies. Humans have trouble creating antibodies to fight animal viruses. This is why you have a limited amount of time to get rabies vaccinations if you think you’ve been infected and rabies still kills people. You can have rabies for months and chances are even as it destroys your brain your immune system won’t recognize it as a virus.
Now, we are slightly luckier with novel coronavirus than rabies because our bodies will eventually recognize it and build a few antibodies, but not in the quantity and not with the quality that it will build antibodies to fight influenza which is a virus that prefers human hosts and is considered a human virus as a result. Even with exposure to coronavirus you do not build up the amount of antibodies you build up against influenza and since it isn’t a human virus those antibodies do not work as well against coronavirus as the antibodies our immune system builds to fight influenza.
Imagine if rabies could be passed human to human with a cough or sneeze instead of a bite… That’s what we are dealing with.