Do scientists understand why for some people getting covid is like a cold and for others its like a flu?

My sister and I got covid at the same time. We are both triple vaxed. My symptoms were mild, like a cold. I was congested. For her, it was like a flu. High fever, coughing and fatigue. Do scientists understand why?

Yes, yes they do.
No, that is something scientists don't understand yet.
See results.
Select gender and age to cast your vote:
Do scientists understand why for some people getting covid is like a cold and for others its like a flu?
Post Opinion