They are caused by viruses and cannot be cured by antibiotics. Occasionally, a cold may be complicated by a bacterial infection such as a sinus infection, an ear infection, or a more serious illness.
Antibiotics are useful when a bacterial infection occurs.
To lower your chances of catching a cold during cold and flu season, wash your hands frequently with soap and water, and keep your hands away from your face. Sore throat . Swollen glands around the neck, or under the arms . A dry cough, or a cough with phlegm . Mild fever, usually less than 101o F, for a day or two .