Of course they don't but nobody wants to hear this; especially not the big pharmaceutical companies. The other aspect of this is that a lot of those people who have little or no symptoms are people who have probably had a cold from a corona virus which is close enough to covid-19 to give them some immunity. There are so many possibilities and the only thing of which we can be sure is that we will only hear the truth those in control of the narrative want us to hear. GD