Infectious diseases (infections) are illnesses that result when certain bacteria or viruses invade the body. Most infections that occur in the general community are not serious, but they can cause uncomfortable symptoms such as fever, cough, runny nose, vomiting, diarrhea, or skin rashes. Because infections can keep people from their usual activities, including work or school, it is important to prevent them whenever possible. In recent years, the availability of household cleaning products containing antibacterial ingredients has increased. Although manufacturers claim that these products offer health benefits, evidence linking the use of antibacterial products to better health for the people who use them has been lacking. It is important to note that many common infections, including the common cold, are due to viruses, not bacteria. Antibacterial products are made to kill bacteria, not viruses.