Question: Could some peoples' immune systems be recognizing COVID-19? [View all]

[Mike 03]

You know these reports of people who are asymptomatic or report a 'slight cold"?

What accounts for the extreme differences among immune response, between a healthy 30 year old who gets severe pneumonia and someone who experiences few or no symptoms?

Is it possible that some people's' immune systems do recognize this virus and defeat it immediately, or don't even recognize it as a threat?

When a person has no symptoms, does that mean their immune system isn't even fighting it? Or does it mean their immune system fought it off so quickly that it never even rose to the level of becoming symptomatic?

Could we find out there are things some people (especially maybe younger people) have done that confer protection, like maybe having been exposed to animals, pets, or been exposed to certain viruses similar to this one in nature?

I know we can't know the answers for sure, but this aspect of the virus is interesting. I wish I knew more about how viruses work. Bats have thousands of viruses but don't get sick from them. Could some people who are not getting very sick already have had this virus, so it's not even perceived as an enemy?