What causes the common cold? What causes the flu? When and why do they strike? Test your knowledge of these cold and flu basics with out list of Frequently Asked Questions.
What causes the common cold?
More than 200 viruses can cause the common cold. A cold virus usually infects only the upper respiratory tract: nose and throat, so symptoms will be predominately above the neck. Symptoms include a runny nose, sore throat, sneezing, coughing, congestion, and watery eyes. These symptoms can last for up to two weeks.