That may be. But there has to be more than "contagious for 5 days without symptoms" and "3% lethality". It's pretty simple: if you are infected, and are contagious, then you will have enough virus to have symptoms. If those symptoms are not noticeable then the virus is not lethal at that point.
If there are two phases: first a low level of infection, some contagion, no or very mild symptoms; followed by high level of infection, much more lethality and obviously contagion, then that is a possible explanation.
I don't know. I'm just telling you that in the simplest case it cannot be lethal and contagious without symptoms.
So a person says
Hey Doc, I have a cough and some congestion.
No fever.
Contagious or not?
I don’t think you can say with certainty that the person isn’t contagious. Too much is unknown.
The doc will think he has the flu or a cold
Unless he asks did you fly on a plane with some chinese people.
Then he might rethink it.
In the meantime, Good Ole Doc just caught the virus.
Other symptoms include NO fever, difficulty breathing.