WHAT CAUSES A COLD?
Breathing in a cold virus does not itself cause a cold. If you try to give someone a cold for example, it takes more than a virus. Scientists have incubated cold viruses, placed them directly on the mucous lining of the nose, and found that their subjects came down with colds only 12 percent of the time. For germs to grow in you, you must have a decreased immune system.
Remember a fever is one of your body’s defense mechanisms, helping you destroy infection. Lowering a fever reduces this defense against disease.