My sister brought up that possibility. It seems that the symptoms of Covid 19 are many and varied and not everyone has all of them. I dunno. All I know is that it hit me hard out of the blue and I didn't what in the heck was happening to me.
Any virus can morph into something else. I wonder where COVID 19 will morph into next and even if/when we get a vaccine it will be for which particular iteration manifestation since the virus does not remain static? T'is a puzzlement.