What is a cold?
What is a cold?
A cold is a contagious upper respiratory infection that affects your nose, throat, sinuses and trachea (windpipe). More than 200 different viruses can cause a cold, but most colds are caused by a rhinovirus.
A cold is a contagious upper respiratory infection that affects your nose, throat, sinuses and trachea (windpipe). More than 200 different viruses can cause a cold, but most colds are caused by a rhinovirus.