a cold is transmitted by many things, these things are as followed: kissing, touching, sneezing, or any other way that the body can transfer body fluids.
Tissues help so that the flem from your nose does not leak down your nose, and so you can blow your nose into it. However, the tissue doesn't take the cold away, it just helps the nose a bit.
aspirated through the upper respiratory tract. Meaning you breath it in. It can also be transmitted by touching a contaminated surface and then touching the nose or eyes, but not through ingestation...