How Do You Catch a Cold?
The most common way cold viruses are spread is not from being around coughing or sneezing, or walking barefoot in the rain, but rather from hand-to-hand contact. For instance, someone with a cold blows their nose then shakes your hand or touches surfaces that you also touch.
Cold viruses can live on pens, computer keyboards, coffee mugs and other objects for hours, so it’s easy to come into contact with such viruses during daily life.
However, the key to remember is that just being exposed to a cold virus does not have to mean that you’ll catch a cold. If your immune system is operating at its peak, it should actually be quite easy for you to fend off the virus without ever getting sick.
If your immune system is impaired, on the other hand, it’s akin to having an open-door policy for viruses; they’ll easily take hold in your body. So the simple and short answer is, you catch a cold due to impairment in your immune system. There are many ways this can result, but the more common contributing factors are:
1.Eating too much sugar and too many grains
2.Not getting enough rest
3.Using insufficient strategies to address emotional stressors in your life
4.Vitamin D deficiency, as discussed below
5.Any combination of the above
Complete article and more helpful information: www.mercola.com: How Long Do Colds Last | Strategies for Prevention and Treatment