Talk about missing the point.
The symptoms being slight possibly is the whole point.
Medicos must be especially wary of having even the slightest symptoms because their customers are the ones more likely to die if they get it.
It is a characteristic of doctors that they think of themselves as God’s gift to mankind. In this case they need to regard themselves as mere mortals.
If they have the virus it might not be particularly noticeable.
The problem is that they can give it to Grannie who is sick to start with and about to get a whole lot sicker after seeing him.
Hurry up and get the whole deal in perspective.