(I am a layman, forgive any misconceptions)
A friend recently got a cold; she had a sniffle, a sick feeling and it was barely more than an annoyance. A week later I get - presumably - the same cold; I get temperature and lethargy, plus the usual cold features such as sore throat, and spend a few days in bed.
To illustrate the point further: most times I get a cold I feel terrible; have a fever, lethargy etc. I will spend various days in bed hoping for it to go away.
My friend on the other hand doesn't even understand what a fever feels like. For her, colds just make her 'sneeze more'.
Who is said to have the stronger immune system?
Is it that her immune system is 'strong' enough to fight off all viruses easily without breaking a sweat? Or does it imply her immune response is weaker, producing less symptoms than mine?
Or is saying that one of us has a 'stronger' immune system a gross oversimplification?