Summarize:

If you have developed a URI, keep yourself at home for at least two or three days (you may need to stay at home longer depending on your symptoms). Keep in mind that every time you cough, sneeze, or even talk, you run the risk of infecting someone else. Because URIs are very contagious, it is important to cover your mouth and nose whenever you sneeze or cough; however, you should not do this with your hand. If possible, sneeze or cough into a tissue or the crook of your arm. The reason you should avoid coughing into your hands is because you use your hands for a variety of activities, including touching objects that others may touch, which means that you are very likely to infect others. If you do cough or sneeze into your hands, wash them with warm water and soap. Viruses and bacteria can be easily transmitted by touching an object that an uninfected individual also touches. Because of this, it is important to clean any objects that you touch while you are sick. You can use a 70% alcohol disinfectant to do this. These objects include: Remote controls, keyboards, telephones, refrigerator door, stair railings, and door knobs.
Stay at home when you know you have become infected. Cover your mouth and nose when coughing and sneezing. Clean objects that you or other infected individuals touch.