The common cold is caused by one of many thousands of viral strains circulating each year. We introduce these viral particles to our bodies when we touch our mouth, nose, or eyes after touching contaminated surfaces. Common symptoms of a cold (or upper respiratory infection) are a runny nose, stuffy nose, sore throat, achy muscles, coughing, and mild fever. Symptoms appear from the interplay of viral replication and the body’s inflammatory response. Some symptoms may appear after 10-12 hours of inoculation and may persist for 7-10 days.