Common Cold Mystery

Here are some commonly held mis-information about the common cold:

There is a myth that common cold enters through our nose. The reality is that studies have used volunteers where the cold virus is dropped directly into the nose. The interesting effect was that only 75% developed cold symptoms. The rest had the virus growing in the nose, but no cold.

This is a mystery. One possible theory is that some people are not able to produce extra inflamatory mediators. These are actually the chemicals produced by the body, which causes the cold symptoms. Ironically, this might imply that people with weaker immune systems, might get infected, but do not show any cold symptoms. This is opposite of those with strong immune systems, which produces the chemical in reaction to the cold virus.

Isn't this an interesting mystery?