I don't see the point you're trying to make. Perhaps you want to interpret asymptomatic cases, or presymptomatic cases as mild. That's something no one in the world does because by definition mild cases are cases where you experience mild symptoms.
The point I was trying to (poorly) make, is that if 40% of posts are asymptomatic, the median case is probably extremely mild (unless as soon as people have symptoms they are very serious, which seems unlikely).
