The common cold is an easily spread infection of the upper respiratory tract.
The rhinovirus is the most common cause of the common cold.
It accounts for 30% to 80% of all cases.
A rhinovirus is an RNA-containing virus of the family Picornaviridae.
There are 99 known types of viruses in this family of viruses.

Other viruses can also cause the common cold.
The Coronavirus causes 10% to 15% of cases.
The flu causes 5% to 15% of cases.
Other cases may be caused by human parainfluenza viruses, human respiratory syncytial virus, adenoviruses, Enteroviruses, and metapneumovirus.
Frequently, more than one virus is present and causing the infection.
In total, over two hundred different viruses[k2] are associated with colds.
The common cold is an easily spread infection of the upper respiratory tract. The rhinovirus is the most common cause of the common cold. It accounts for 30% to 80% of all cases. A rhinovirus is an RNA-containing virus of the family Picornaviridae. There are 99 known types of viruses in this family of viruses.
Other viruses can also cause the common cold. The Coronavirus causes 10% to 15% of cases. The flu causes 5% to 15% of cases. Other cases may be caused by human parainfluenza viruses, human respiratory syncytial virus, adenoviruses, Enteroviruses, and metapneumovirus. Frequently, more than one virus is present and causing the infection. In total, over two hundred different viruses[k2] are associated with colds.
Common cold