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=Causes = ==The cold, or viral upper respiratory tract infection, is one of the most common viruses. The cold itself is a reaction to the virus attacking the immune system. Colds are almost always spread by chaining through multiple people, a single spray of virus-infected fluids is enough to transmit the illness. == == The common cold is NOT caused by cold weather as it is commonly believed. During the winter and fall, more people spend time indoors in close proximity with other which allows the virus to spread at a rapid rate. ==


== The Common Cold is both a lifestyle disease and a disease you can "catch". If the body lacks exercise and is on an unhealthy diet (lack of vitamins and minerals), the immune system is far more susceptible to even the weakest strains of the virus. Additionally, smoking, air pollution, allergies or other illnesses can increase the chance of catching the disease and causing further complications. ==

==The Aerosol-Transmission is the most common way the cold is spread. During the transmission, the infected person’s body fluids (from sneezing, coughing, etc.) land on another person and the virus begins replication from there. A simple way to avoid spreading the cold through this method is making sure you cover your mouth and/or nose properly. ==

http://www.brainpop.com/health/diseasesinjuriesandconditions/viruses This may help you understand how viruses work, enter the body, and how to avoid them.
 * Brainpop - Viruses**



 * Quiz Question:** What main factors cause the common cold?

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